ITunes eats 100% of the processor

Since yesterday evening (Still pre-iTunes 7.2) iTunes eats up 100% of the processor and won't respond anymore. When I force quit it and restart it, only seconds later (interacting with it or not) same thing happens.
I deleted the plists for iTunes and that helped yesterday evening, today I fired up iTunes - same behaviour.
Repairing disk permissions didn't help and there is no thing like "determing gapless playback". Disabling plug-ins/add-ons didn't help as well. I can't find anything in the logs.
I sampled the process with the activity monitor and I get:
Analysis of sampling pid 591 every 10.000000 milliseconds
Call graph:
100 Thread_0f07
100 0x3089
100 0x3162
100 0x24c33f
100 0x38182
100 0x24bc36
100 0x24b1c6
100 0x1b12ff
100 WaitNextEvent
100 WNEInternal
100 GetNextEventMatchingMask
100 RunCurrentEventLoopInMode
100 CFRunLoopRunInMode
100 CFRunLoopRunSpecific
100 TimerVector
100 0x32ff0b
100 0x32fb34
100 0x30f2c6
72 0x30c84e
70 0x2d1a1e
16 0x2d1907
16 0x2d1907
15 0x2d190c
15 0x2d190c
7 0x2d18da
4 0x2d121c
4 0x2d121c
1 0x2d1230
1 0x2d1230
1 0x2d1235
1 0x2d1235
1 0x2d1239
1 0x2d1239
7 0x2d1902
7 0x2d1902
6 0x2d1905
6 0x2d1905
4 0x2d1962
4 0x2d1962
3 0x2d191a
3 0x2d191a
3 0x2d195e
3 0x2d195e
2 0x2d18bb
2 0x2d18bb
2 0x2d195c
2 0x2d195c
1 0x2d18b6
1 0x2d18b6
1 0x2d18c6
1 0x2d18c6
1 0x2d18f5
1 0x2d18f5
1 0x2d1960
1 0x2d1960
1 0x2d1982
1 0x2d1982
1 0x2d1a11
1 0x2d1a11
1 0x2d1a26
1 0x2d1a26
25 0x30c884
15 0x2d1a85
9 0x2d1a1e
2 0x2d18da
1 0x2d121c
1 0x2d121c
1 0x2d1239
1 0x2d1239
1 0x2d18b7
1 0x2d18b7
1 0x2d18b8
1 0x2d18b8
1 0x2d18eb
1 0x2d18eb
1 0x2d1902
1 0x2d1902
1 0x2d190c
1 0x2d190c
1 0x2d191a
1 0x2d191a
1 0x2d1a1e
2 0x2d18b2
2 0x2d18b2
1 0x2d19da
1 0x2d19da
1 0x2d1a26
1 0x2d1a26
1 0x2d1a41
1 0x2d1a41
1 0x2d1a85
7 0x2d1aa5
2 0x2d12af
2 0x2d12af
2 0x2d1539
1 0x2d1256
1 0x2d1256
1 0x2d12ab
1 0x2d12ab
1 0x2d14f0
1 0x2d14f0
1 0x2d14fa
1 0x2d14fa
1 0x2d1505
1 0x2d1505
1 0x2d1a6b
1 0x2d1a6b
1 0x2d1a79
1 0x2d1a79
1 0x30c884
1 0x2d19d6
1 0x2d19d6
1 0x2d1a43
1 0x2d1a43
1 0x30c85f
1 0x30c85f
100 Thread_1003
100 pthreadbody
100 _apeagent
100 machmsgtrap
100 machmsgtrap
100 Thread_1103
100 pthreadbody
100 CAPThread::Entry(CAPThread*)
100 HALRunLoop::OwnThread(void*)
100 CFRunLoopRunInMode
100 CFRunLoopRunSpecific
100 machmsgtrap
100 machmsgtrap
100 Thread_1203
100 pthreadbody
100 0x325f09
100 0x235b0e
100 semaphorewait_signaltrap
100 semaphorewait_signaltrap
100 Thread_1303
100 pthreadbody
100 0x218812
100 CFRunLoopRun
100 CFRunLoopRunSpecific
100 machmsgtrap
100 machmsgtrap
100 Thread_1403
100 pthreadbody
100 select
100 select
Total number in stack (recursive counted multiple, when >=5):
5 pthreadbody
Sort by top of stack, same collapsed (when >= 5):
machmsgtrap 300
select 100
semaphorewait_signaltrap 100
0x2d1907 16
0x2d190c 16
0x2d1902 8
0x2d1905 6
0x2d121c 5
Sample analysis of process 591 written to file /dev/stdout
Sampling process 591 each 10 msecs 100 times
Does anyone has an idea what's going on?
I really would not like to do an archive and install just for iTunes because of my LaTeX-tree…

I repaired now the HDD from the installation disc and did an archive and install, still the problem exists

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ITunes using 100 % of the processor

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Diagnostics test
Microsoft Windows XP Professional Service Pack 3 (Build 2600)
ECS G31T-M7
iTunes 10.5.2.11
QuickTime 7.6.9
FairPlay 1.13.37
Apple Application Support 2.1.6
iPod Updater Library 10.0d2
CD Driver 2.2.0.1
CD Driver DLL 2.1.1.1
Apple Mobile Device 4.0.0.97
Apple Mobile Device Driver 1.57.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.5.502
Gracenote MusicID 1.9.5.115
Gracenote Submit 1.9.5.143
Gracenote DSP 1.9.5.45
iTunes Serial Number 0012ABAC07F3CCB0
Current user is an administrator.
The current local date and time is 2011-12-31 14:06:21.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is not supported.
Core Media is not supported. (16005)
Video Display Information
Intel(R) G33/G31 Express Chipset Family
**** External Plug-ins Information ****
No external plug-ins installed.
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:        {7599FAD1-1BB9-4AC6-80AF-404253DC519E}
Description:            Atheros L2 Fast Ethernet 10/100 Base-T Controller - Packet Scheduler Miniport
IP Address:             192.168.1.5
Subnet Mask:          255.255.255.0
Default Gateway:    192.168.1.1
DHCP Enabled:      Yes
DHCP Server:         192.168.1.1
Lease Obtained:     Sat Dec 31 13:46:09 2011
Lease Expires:       Tue Jan 03 13:46:09 2012
DNS Servers:         192.168.1.1
Active Connection: LAN Connection
Connected:             Yes
Online:                    Yes
Using Modem:        No
Using LAN:             Yes
Using Proxy:           No
SSL 3.0 Support:     Enabled
TLS 1.0 Support:     Enabled
Firewall Information
Windows Firewall is on.
iTunes is enabled in Windows Firewall.
Connection attempt to Apple web site was successful.
Connection attempt to browsing iTunes Store was successful.
Connection attempt to purchasing from iTunes Store was successful.
Connection attempt to iPhone activation server was unsuccessful.
The network connection timed out.
Connection attempt to firmware update server was unsuccessful.
The network connection timed out.
Connection attempt to Gracenote server was successful.
Last successful iTunes Store access was 2011-12-31 14:00:02.
**** Device Connectivity Tests ****
iPodService 10.5.2.11 is currently running.
iTunesHelper 10.5.2.11 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
Universal Serial Bus Controllers:
Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C8. Device is working properly.
Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C9. Device is working properly.
Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27CA. Device is working properly.
Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27CB. Device is working properly.
Intel(R) 82801G (ICH7 Family) USB2 Enhanced Host Controller - 27CC. Device is working properly.
No FireWire (IEEE 1394) Host Controller found.
Connected Device Information:
rawkiss’s iPhone, iPhone 3G running firmware version 4.0
Serial Number:       86931UEAY7H
**** Device Sync Tests ****
Sync tests completed successfully.

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http://kb.adobe.com/selfservice/viewContent.do?externalId=328730
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ITunes eats 100% of the processor

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