First - backup all your important stuff IMMEDIATELY!!! There are numerous things that could cause this - and many of them will hose your system.
Next, I'd suggest that you download updated definitions for the virus checking programs that you've mentioned - then install them on your system - then recheck your system.
Also, try some antispyware tools (with updated definitions) - this seems (to me) to be virus or spyware related.
Just a suggestion - but you could try a repair installation of XP. This'll fix any problems with the OS (but won't fix problems with viruses or spyware).
Here's a link to some instructions: http://www.michaelstevenstech.com/XPrepairinstall.htm
If this fails (and you've backed up your important stuff) - you can do a format and reinstall of the system. This'll fix any software and virus problems with your system (but won't address any hardware problems that may exist)
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
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