Probook 6540b; more memory causes system to slow down dramatical​ly

Hi,
I have a Probook 6540b with Intel i5 and I'm running Windows 7 Ultimate 64bit.
I bought the notebook with 4GB RAM installed. I heard from the supplier that the computers tend to be "buggy" with more than 2GB RAM, but I needed the memory so I didn't mind much.
Recently my computer slowed down significantly. Taking ages to boot up and just as long to open even an internet browser.
Remembering what the supplier told me I removed the extra 2GB RAM and my computer suddenly responded as if it was brand new.
I would like to be able to have 4GB RAM available, but not at the cost of performance.
Is there a solution available?
P.S.. The extra 2G RAM is a Kingston module - if that could be of any help...

Turns out it was a problem with the battery and removing the RAM was just a fluke... Sorry...

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        +                                                                     !         : | 267 -[ABRecord valueForProperty:]  (in AddressBook) + 139  [0x7fff8ccd4dee]
        +                                                                     !         : | + 264 -[ABRecord nts_ValueForProperty:]  (in AddressBook) + 25  [0x7fff8ccd4f01]
        +                                                                     !         : | + ! 264 -[ABRecord nts_ValueForProperty:row:]  (in AddressBook) + 48  [0x7fff8ccd4f33]
        +                                                                     !         : | + !   213 -[ABCDRecord nts_ValueForProperty:row:record:]  (in AddressBook) + 192  [0x7fff8ccd50e1]
        +                                                                     !         : | + !   : 202 -[ABCDRecord copyMultiValueWithRecord:withProperty:]  (in AddressBook) + 68  [0x7fff8cd802e2]
        +                                                                     !         : | + !   : | 147 -[ABMultiValueCoreDataWrapper initWithRecord:managedObject:property:]  (in AddressBook) + 177  [0x7fff8cd870bb]
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        +                                                                     !         : | + !   : | + ! : | + 2 objc_msgSend  (in libobjc.A.dylib) + 15  [0x7fff8d0e7e8f]
        +                                                                     !         : | + !   : | + ! : | + 1 -[NSSet allObjects]  (in CoreFoundation) + 371  [0x7fff8ac4b023]
        +                                                                     !         : | + !   : | + ! : | +   1 -[NSSet getObjects:count:]  (in CoreFoundation) + 304  [0x7fff8ac4b1c0]
        +                                                                     !         : | + !   : | + ! : | +     1 __CFBasicHashFastEnumeration  (in CoreFoundation) + 1  [0x7fff8ac274f1]
        +                                                                     !         : | + !   : | + ! : | 2 objc_msgSend  (in libobjc.A.dylib) + 15  [0x7fff8d0e7e8f]
        +                                                                     !         : | + !   : | + ! : | 1 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 27  [0x7fff938f15bb]
        +                                                                     !         : | + !   : | + ! : | + 1 -[_NSFaultingMutableSet willRead]  (in CoreData) + 1  [0x7fff938ed011]
        +                                                                     !         : | + !   : | + ! : | 1 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 1  [0x7fff938f15a1]
        +                                                                     !         : | + !   : | + ! : 3 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 670  [0x7fff8cd81517]
        +                                                                     !         : | + !   : | + ! : | 1 -[NSManagedObject valueForKey:]  (in CoreData) + 61  [0x7fff938ecb9d]
        +                                                                     !         : | + !   : | + ! : | + 1 _PFRawIndexForKnownKey  (in CoreData) + 65  [0x7fff9388dbc1]
        +                                                                     !         : | + !   : | + ! : | +   1 _PFRawFastIndexForKnownKey  (in CoreData) + 73  [0x7fff9388dcc9]
        +                                                                     !         : | + !   : | + ! : | +     1 CFStringGetCStringPtr  (in CoreFoundation) + 6  [0x7fff8abd05c6]
        +                                                                     !         : | + !   : | + ! : | 1 -[NSManagedObject valueForKey:]  (in CoreData) + 91  [0x7fff938ecbbb]
        +                                                                     !         : | + !   : | + ! : | 1 objc_msgSend  (in libobjc.A.dylib) + 30  [0x7fff8d0e7e9e]
        +                                                                     !         : | + !   : | + ! : 2 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 91  [0x7fff8cd812d4]
        +                                                                     !         : | + !   : | + ! :   2 +[ABCDRecord entityNameForPropertyKey:]  (in AddressBook) + 25  [0x7fff8ccd0979]
        +                                                                     !         : | + !   : | + ! :     1 -[NSDictionary(NSKeyValueCoding) valueForKey:]  (in Foundation) + 1  [0x7fff89078404]
        +                                                                     !         : | + !   : | + ! :     1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
        +                                                                     !         : | + !   : | + ! 9 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 726  [0x7fff8cd811bc]
        +                                                                     !         : | + !   : | + ! : 9 +[NSDictionary dictionaryWithObjects:forKeys:]  (in CoreFoundation) + 49  [0x7fff8aca0371]
        +                                                                     !         : | + !   : | + ! :   4 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 1308  [0x7fff8ac74f6c]
        +                                                                     !         : | + !   : | + ! :   | 4 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]  (in CoreFoundation) + 880  [0x7fff8ac26ce0]
        +                                                                     !         : | + !   : | + ! :   |   3 CFDictionaryCreateMutable  (in CoreFoundation) + 68  [0x7fff8abd1cb4]
        +                                                                     !         : | + !   : | + ! :   |   + 3 __CFDictionaryCreateGeneric  (in CoreFoundation) + 1400  [0x7fff8abd2288]
        +                                                                     !         : | + !   : | + ! :   |   +   2 CFBasicHashCreate  (in CoreFoundation) + 127  [0x7fff8abd232f]
        +                                                                     !         : | + !   : | + ! :   |   +   ! 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 400  [0x7fff8abc9310]
        +                                                                     !         : | + !   : | + ! :   |   +   ! : 1 CFAllocatorAllocate  (in CoreFoundation) + 214  [0x7fff8abc9546]
        +                                                                     !         : | + !   : | + ! :   |   +   ! 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 88  [0x7fff8abc91d8]
        +                                                                     !         : | + !   : | + ! :   |   +   1 CFBasicHashCreate  (in CoreFoundation) + 668  [0x7fff8abd254c]
        +                                                                     !         : | + !   : | + ! :   |   1 CFDictionaryCreateMutable  (in CoreFoundation) + 1  [0x7fff8abd1c71]
        +                                                                     !         : | + !   : | + ! :   2 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 78  [0x7fff8ac74a9e]
        +                                                                     !         : | + !   : | + ! :   | 2 look_up_class  (in libobjc.A.dylib) + 146  [0x7fff8d0e7a0f]
        +                                                                     !         : | + !   : | + ! :   |   1 NXMapGet  (in libobjc.A.dylib) + 42  [0x7fff8d0e3ad5]
        +                                                                     !         : | + !   : | + ! :   |   + 1 _mapStrHash  (in libobjc.A.dylib) + 59  [0x7fff8d0e3bd1]
        +                                                                     !         : | + !   : | + ! :   |   1 NXMapGet  (in libobjc.A.dylib) + 61  [0x7fff8d0e3ae8]
        +                                                                     !         : | + !   : | + ! :   1 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 831  [0x7fff8ac74d8f]
        +                                                                     !         : | + !   : | + ! :   | 1 __bzero  (in libsystem_c.dylib) + 0  [0x7fff8bdf5abe]
        +                                                                     !         : | + !   : | + ! :   1 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 1257  [0x7fff8ac74f39]
        +                                                                     !         : | + !   : | + ! :   | 1 -[__NSArrayI getObjects:range:]  (in CoreFoundation) + 43  [0x7fff8ac1c39b]
        +                                                                     !         : | + !   : | + ! :   |   1 -[__NSArrayI count]  (in CoreFoundation) + 0  [0x7fff8ac122d0]
        +                                                                     !         : | + !   : | + ! :   1 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 1  [0x7fff8ac74a51]
        +                                                                     !         : | + !   : | + ! 5 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 113  [0x7fff8cd80f57]
        +                                                                     !         : | + !   : | + ! : 3 objc_msgSend_vtable9  (in libobjc.A.dylib) + 16  [0x7fff8d0e9250]
        +                                                                     !         : | + !   : | + ! : 1 CFBasicHashGetCount  (in CoreFoundation) + 8  [0x7fff8abd7598]
        +                                                                     !         : | + !   : | + ! : 1 CFDictionaryGetCount  (in CoreFoundation) + 52  [0x7fff8abdaec4]
        +                                                                     !         : | + !   : | + ! 3 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 766  [0x7fff8cd811e4]
        +                                                                     !         : | + !   : | + ! : 3 -[__NSCFDictionary setObject:forKey:]  (in CoreFoundation) + 255  [0x7fff8ac262bf]
        +                                                                     !         : | + !   : | + ! :   3 CFDictionarySetValue  (in CoreFoundation) + 252  [0x7fff8abd2a8c]
        +                                                                     !         : | + !   : | + ! :     1 CFBasicHashSetValue  (in CoreFoundation) + 179  [0x7fff8abd2b83]
        +                                                                     !         : | + !   : | + ! :     1 __CFBasicHashReplaceValue  (in CoreFoundation) + 38  [0x7fff8abfd846]
        +                                                                     !         : | + !   : | + ! :     | 1 __CFDictionaryStandardRetainValue  (in CoreFoundation) + 71  [0x7fff8abd3d27]
        +                                                                     !         : | + !   : | + ! :     |   1 _CFRetain  (in CoreFoundation) + 245  [0x7fff8abc8065]
        +                                                                     !         : | + !   : | + ! :     |     1 OSAtomicCompareAndSwap64Barrier$VARIANT$mp  (in libsystem_c.dylib) + 8  [0x7fff8be6254c]
        +                                                                     !         : | + !   : | + ! :     1 __CFBasicHashReplaceValue  (in CoreFoundation) + 1  [0x7fff8abfd821]
        +                                                                     !         : | + !   : | + ! 2 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 695  [0x7fff8cd8119d]
        +                                                                     !         : | + !   : | + ! : 1 +[NSArray array]  (in CoreFoundation) + 17  [0x7fff8ac241b1]
        +                                                                     !         : | + !   : | + ! : | 1 +[NSObject alloc]  (in CoreFoundation) + 0  [0x7fff8ac0e320]
        +                                                                     !         : | + !   : | + ! : 1 +[NSArray array]  (in CoreFoundation) + 38  [0x7fff8ac241c6]
        +                                                                     !         : | + !   : | + ! :   1 -[__NSPlaceholderArray initWithObjects:count:]  (in CoreFoundation) + 113  [0x7fff8ac12041]
        +                                                                     !         : | + !   : | + ! 1 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 75  [0x7fff8cd80f31]
        +                                                                     !         : | + !   : | + ! : 1 CFDictionaryGetValue  (in CoreFoundation) + 143  [0x7fff8abc6f4f]
        +                                                                     !         : | + !   : | + ! :   1 CFBasicHashFindBucket  (in CoreFoundation) + 1897  [0x7fff8abc76d9]
        +                                                                     !         : | + !   : | + ! :     1 __CFStringHash  (in CoreFoundation) + 724  [0x7fff8abd0e84]
        +                                                                     !         : | + !   : | + ! 1 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 146  [0x7fff8cd80f78]
        +                                                                     !         : | + !   : | + ! : 1 -[NSDictionary allValues]  (in CoreFoundation) + 373  [0x7fff8ac27195]
        +                                                                     !         : | + !   : | + ! :   1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
        +                                                                     !         : | + !   : | + ! 1 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 232  [0x7fff8cd80fce]
        +                                                                     !         : | + !   : | + ! : 1 -[__NSArrayI count]  (in CoreFoundation) + 11  [0x7fff8ac122db]
        +                                                                     !         : | + !   : | + ! 1 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 116  [0x7fff8cd80f5a]
        +                                                                     !         : | + !   : | + ! 1 objc_msgSend  (in libobjc.A.dylib) + 20  [0x7fff8d0e7e94]
        +                                                                     !         : | + !   : | + 35 +[ABMultiValueCoreDataWrapper populateIdentifiers:values:labels:primaryIdentifier:withDataFromRecord:managedO bject:property:]  (in AddressBook) + 435  [0x7fff8cd876d0]
        +                                                                     !         : | + !   : | + ! 33 +[ABMultiValueCoreDataWrapper messagingAddressesWithService:owner:withAddressBook:]  (in AddressBook) + 61  [0x7fff8cd89130]
        +                                                                     !         : | + !   : | + ! : 12 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 206  [0x7fff8cd80fb4]
        +                                                                     !         : | + !   : | + ! : | 7 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 670  [0x7fff8cd81517]
        +                                                                     !         : | + !   : | + ! : | + 6 -[NSManagedObject valueForKey:]  (in CoreData) + 61  [0x7fff938ecb9d]
        +                                                                     !         : | + !   : | + ! : | + ! 3 _PFRawIndexForKnownKey  (in CoreData) + 65  [0x7fff9388dbc1]
        +                                                                     !         : | + !   : | + ! : | + ! : 3 _PFRawFastIndexForKnownKey  (in CoreData) + 278,195  [0x7fff9388dd96,0x7fff9388dd43]
        +                                                                     !         : | + !   : | + ! : | + ! 1 _PFRawIndexForKnownKey  (in CoreData) + 194  [0x7fff9388dc42]
        +                                                                     !         : | + !   : | + ! : | + ! : 1 -[NSObject methodForSelector:]  (in CoreFoundation) + 52  [0x7fff8ac58a64]
        +                                                                     !         : | + !   : | + ! : | + ! :   1 object_getClass  (in libobjc.A.dylib) + 36  [0x7fff8d0e7b69]
        +                                                                     !         : | + !   : | + ! : | + ! 1 _PFRawIndexForKnownKey  (in CoreData) + 214  [0x7fff9388dc56]
        +                                                                     !         : | + !   : | + ! : | + ! : 1 -[__NSCFString isEqualToString:]  (in CoreFoundation) + 253  [0x7fff8ac2667d]
        +                                                                     !         : | + !   : | + ! : | + ! :   1 CFEqual  (in CoreFoundation) + 317  [0x7fff8abd4afd]
        +                                                                     !         : | + !   : | + ! : | + ! :     1 -[_PFString isEqual:]  (in CoreData) + 48  [0x7fff93886f10]
        +                                                                     !         : | + !   : | + ! : | + ! :       1 _compareUnknownStrings  (in CoreData) + 92  [0x7fff93886f8c]
        +                                                                     !         : | + !   : | + ! : | + ! :         1 CFStringGetSystemEncoding  (in CoreFoundation) + 1  [0x7fff8abe7da1]
        +                                                                     !         : | + !   : | + ! : | + ! 1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
        +                                                                     !         : | + !   : | + ! : | + 1 -[NSManagedObject valueForKey:]  (in CoreData) + 87  [0x7fff938ecbb7]
        +                                                                     !         : | + !   : | + ! : | +   1 _kvcPropertysPublicGetters  (in CoreData) + 19  [0x7fff938ecc13]
        +                                                                     !         : | + !   : | + ! : | 4 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 687  [0x7fff8cd81528]
        +                                                                     !         : | + !   : | + ! : | + 3 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 52  [0x7fff938f15d4]
        +                                                                     !         : | + !   : | + ! : | + ! 3 -[NSSet allObjects]  (in CoreFoundation) + 398  [0x7fff8ac4b03e]
        +                                                                     !         : | + !   : | + ! : | + !   1 +[NSArray arrayWithObjects:count:]  (in CoreFoundation) + 26  [0x7fff8ac275ca]
        +                                                                     !         : | + !   : | + ! : | + !   : 1 _objc_rootAlloc  (in libobjc.A.dylib) + 21  [0x7fff8d0eb035]
        +                                                                     !         : | + !   : | + ! : | + !   :   1 +[NSArray allocWithZone:]  (in CoreFoundation) + 79  [0x7fff8ac0f76f]
        +                                                                     !         : | + !   : | + ! : | + !   :     1 _CFAppVersionCheckLessThan  (in CoreFoundation) + 56  [0x7fff8ac13228]
        +                                                                     !         : | + !   : | + ! : | + !   :       1 CFEqual  (in CoreFoundation) + 239  [0x7fff8abd4aaf]
        +                                                                     !         : | + !   : | + ! : | + !   1 +[NSArray arrayWithObjects:count:]  (in CoreFoundation) + 49  [0x7fff8ac275e1]
        +                                                                     !         : | + !   : | + ! : | + !   : 1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
        +                                                                     !         : | + !   : | + ! : | + !   1 -[NSObject autorelease]  (in CoreFoundation) + 5  [0x7fff8ac10585]
        +                                                                     !         : | + !   : | + ! : | + 1 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 1  [0x7fff938f15a1]
        +                                                                     !         : | + !   : | + ! : | 1 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 91  [0x7fff8cd812d4]
        +                                                                     !         : | + !   : | + ! : |   1 +[ABCDRecord entityNameForPropertyKey:]  (in AddressBook) + 25  [0x7fff8ccd0979]
        +                                                                     !         : | + !   : | + ! : |     1 objc_msgSend  (in libobjc.A.dylib) + 25  [0x7fff8d0e7e99]
        +                                                                     !         : | + !   : | + ! : 12 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 726  [0x7fff8cd811bc]
        +                                                                     !         : | + !   : | + ! : | 12 +[NSDictionary dictionaryWithObjects:forKeys:]  (in CoreFoundation) + 49  [0x7fff8aca0371]
        +                                                                     !         : | + !   : | + ! : |   4 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 1308  [0x7fff8ac74f6c]
        +                                                                     !         : | + !   : | + ! : |   + 4 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]  (in CoreFoundation) + 880  [0x7fff8ac26ce0]
        +                                                                     !         : | + !   : | + ! : |   +   4 CFDictionaryCreateMutable  (in CoreFoundation) + 68  [0x7fff8abd1cb4]
        +                                                                     !         : | + !   : | + ! : |   +     3 __CFDictionaryCreateGeneric  (in CoreFoundation) + 1400  [0x7fff8abd2288]
        +                                                                     !         : | + !   : | + ! : |   +     ! 2 CFBasicHashCreate  (in CoreFoundation) + 127  [0x7fff8abd232f]
        +                                                                     !         : | + !   : | + ! : |   +     ! : 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 400  [0x7fff8abc9310]
        +                                                                     !         : | + !   : | + ! : |   +     ! : | 1 malloc_zone_malloc  (in libsystem_c.dylib) + 77  [0x7fff8be6e3c8]
        +                                                                     !         : | + !   : | + ! : |   +     ! : |   1 szone_malloc_should_clear  (in libsystem_c.dylib) + 1115  [0x7fff8be3900e]
        +                                                                     !         : | + !   : | + ! : |   +     ! : |     1 tiny_malloc_from_free_list  (in libsystem_c.dylib) + 1217  [0x7fff8be387bc]
        +                                                                     !         : | + !   : | + ! : |   +     ! : 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 550  [0x7fff8abc93a6]
        +                                                                     !         : | + !   : | + ! : |   +     ! 1 CFBasicHashCreate  (in CoreFoundation) + 757  [0x7fff8abd25a5]
        +                                                                     !         : | + !   : | + ! : |   +     1 __CFDictionaryCreateGeneric  (in CoreFoundation) + 241  [0x7fff8abd1e01]
        +                                                                     !         : | + !   : | + ! : |   2 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 225  [0x7fff8ac74b31]

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    "Sophos"
    "Symantec / Norton"
    "Trusteer Rapport"
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    http://www.trusteer.com/support/uninstalling-rapport-mac-os-x
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