MBP 5.1 I have a recent problem with airport connectivity. ethernet connection is working fine, but wifi has become extremely slow and bad functioning. signal is received, no problem with the wlan (my husband 's wifi with MBP is perfect) please help

I have a MBP 5.1 with snow leopard 10.6.8. It has been working fine until few days ago, when it started to have different problems:
1) airport is not working well. it is extremely slow, has difficulties in fully loading pages, looses connectivity, It is not browser related, behaves thesame in safari or firefox; it is not the router/wlan; my husband mbp wifi works fine (as it was mine...) and iphone wifi is also working fine. it sees the signal and different networks. , it is also very very slow in opening skype (after that, it is working ok) if I connect via ethernet cable to the same router, everything works perfectly and with the correct speed.could it be a damaged airport card? a software problem/corruption? logic board? (I hope not, the computer is out of apple care now....)
2) after a certain time (more than hours) of use, the trackpad is behaving strangly, increase sensitivity to touch, unwanted selection of folders, files and text or images in web pages when i move the cursor, the cursor jumping all over the places while writing, ecc I have the impression it starts doing that when I use heavily the CPU ( and the temperature goes up). Is this again a problem of the mother/logic board?
I had recently serviced it since it was not booting properly, but except some permissions repaired, they did noit find anything wrong in the hard drive (which I have now substituted with a SSD) or other hardware.
thanks in advance for any help/suggestions
alessandra

I think I solved the wifi connection problem, just by switching off completely the router! sounds trivial, but in this case it worked!!!
the funny behaviour of the trackpad/cursor still persists. any suggestion???
thanks again

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Hardware Information:
          MacBook Pro (15-inch, Mid 2012)
          MacBook Pro - model: MacBookPro9,1
          1 2.6 GHz Intel Core i7 CPU: 4 cores
          8 GB RAM
Video Information:
          NVIDIA GeForce GT 650M - VRAM: 1024 MB
          Intel HD Graphics 4000 - VRAM: 512 MB
System Software:
          Mac OS X 10.7.5 (11G63b) - Uptime: 0 days 1:17
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          TOSHIBA MK7559GSXF disk0 : (750.16 GB)
                    disk0s1 (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 749.3 GB (598.4 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          MATSHITADVD-R   UJ-8A8
USB Information:
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Inc. Apple Internal Keyboard / Trackpad
          Apple Computer, Inc. IR Receiver
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
FireWire Information:
Thunderbolt Information:
          Apple, Inc. MacBook Pro
Kernel Extensions:
          com.hzsystems.terminus.driver          Version: 4
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          [not loaded] ftp-proxy.plist
Problem System Launch Agents:
Launch Daemons:
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          [loaded] com.absolute.rpcgeo.plist
          [loaded] com.absolute.rpcnet.plist
          [loaded] com.adobe.fpsaud.plist
          [loaded] com.adobe.SwitchBoard.plist
          [loaded] com.google.keystone.daemon.plist
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          [loaded] com.zeobit.MacKeeper.AntiVirus.plist
Launch Agents:
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          [not loaded] com.adobe.AAM.Updater-1.0.plist
          [loaded] com.google.keystone.agent.plist
          [loaded] SBA_ListenerAgent.plist
User Launch Agents:
          [loaded] com.adobe.AAM.Updater-1.0.plist
          [loaded] com.adobe.ARM.202f4087f2bbde52e3ac2df389f53a4f123223c9cc56a8fd83a6f7ae.plist
User Login Items:
          iTunesHelper
          uTorrent
          Android File Transfer Agent
3rd Party Preference Panes:
          Flash Player
Internet Plug-ins:
          AdobePDFViewer.plugin
          AdobePDFViewerNPAPI.plugin
          Flash Player.plugin
          FlashPlayer-10.6.plugin
          googletalkbrowserplugin.plugin
          JavaAppletPlugin.plugin
          npgtpo3dautoplugin.plugin
          o1dbrowserplugin.plugin
          QuickTime Plugin.plugin
          SharePointBrowserPlugin.plugin
User Internet Plug-ins:
Bad Fonts:
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Top Processes by CPU:
               3%          WindowServer
               1%          EtreCheck
               0%          ps
               0%          Mac_SwapperDemon
               0%          mds
               0%          aosnotifyd
Top Processes by Memory:
          156 MB             AntiVirus
          131 MB             Google
          90 MB              WindowServer
          82 MB              Finder
          74 MB              loginwindow
          66 MB              SystemUIServer
          57 MB              Dock
          49 MB              mds
          49 MB              PhotoStreamAgent
          41 MB              opendirectoryd
Virtual Memory Statistics
          5.63 GB            Free RAM
          1.37 GB            Active RAM
          305 MB             Inactive RAM
          708 MB             Wired RAM
          722 MB             Page-ins
          0 B                Page-outs

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