Do you have Windows Update set to automatically download and install?
Are you using a antivirus suite, or a stand alone scanner?
Windows Defender active?
How many sidebar gadgets do you have running?
What hotfixes do you have installed?
You can just get a dump of the list by running "systeminfo" from the command prompt.
Here's a print of mine.
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Hotfix(s): 61 Hotfix(s) Installed.
[01]: {949C97E1-C970-4B37-881D-D91B0F064974}
[02]: KB905866
[03]: KB925902
[04]: KB927084
[05]: KB928135
[06]: KB928190
[07]: KB928253
[08]: KB929011
[09]: KB929399
[10]: KB929577
[11]: KB929615
[12]: KB929685
[13]: KB929735
[14]: KB929761
[15]: KB929762
[16]: KB929763
[17]: KB929777
[18]: KB929909
[19]: KB929913
[20]: KB930163
[21]: KB930178
[22]: KB930568
[23]: KB930857
[24]: KB931099
[25]: KB931573
[26]: KB932094
[27]: KB932309
[28]: KB932471
[29]: KB932818
[30]: KB933579
[31]: KB933729
[32]: KB935652
[33]: KB936021
[34]: KB936782
[35]: KB936825
[36]: KB937077
[37]: KB938127
[38]: KB939159
[39]: KB940105
[40]: KB941202
[41]: KB941229
[42]: KB941600
[43]: KB928089
[44]: KB929123
[45]: KB929916
[46]: KB931213
[47]: KB931836
[48]: KB932246
[49]: KB933360
[50]: KB933566
[51]: KB933928
[52]: KB935280
[53]: KB935807
[54]: KB936824
[55]: KB937143
[56]: KB938123
[57]: KB938194
[58]: KB938979
[59]: KB939653
[60]: KB941649
[61]: KB941651
Here's a link to a KB article that details them.
http://support.microsoft.com/kb/894199
Maybe that doesn't help your situation, but it might answer some questions you might not have had.
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