I think there's 2 likely possibilites here:
1) A virus infection that has slipped past your protection, and
2) A corruption of a windows file
First, please check your Event Viewer (this assumes you're using XP). Go to Start...Run...and type in "eventvwr.msc" (without the quotes) and press Enter. In the left hand pane will be 3 categories (Application, Security, and System). Please click on each one in turn while viewing the messages in the right hand pane. You may need to right click on any Error message and select "Properties" to view the exact error message. Please let us know what error messages that you've found.
For the virus thingie, do a couple of these free, online scans to double check your system:
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In order to check the file corruption issue you can do the following steps:
1) Run SFC.EXE /SCANNOW from the Run prompt. This will scan your system for any changed windows protected files and will prompt you for your CD to replace them. Please visit Windows Update immediately afterwards to ensure that one of your updates hasn't been changed.
2) If that doesn't correct it, then I'd try a repair install of XP. This will preserve your programs and settings, while replacing all of the files that windows needs to operate. Here's a link for the instructions:
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. Please visit Windows Update immediately afterwards to reapply the updates that were changed by the repair install
3-Or use system restore
Best Regards
Reza