There is some sort of virus on my computer which i cannot get rid off and won't show up in McAffee or avast! scans. I think I got it form running a dodgy .exe file but I'm not sure.

Every time I try to browse through my files in windows explorer or try to open internet explorer (which i don't usually use) the same error message box pops up saying:

"Attention [username]! Some dangerous viruses detected in your system. Microsoft Windows XP files corrupted. This may lead to the destruction of important files in C:\WINDOWS. Download protection software now!

Click OK to download the antispyware. (Recommended)"

Then you can click either yes or no but you can't close the program without ending the task and then it just starts up again by itself. When I click one of the buttons it takes me to a site which is blocked by McAffee for identity fraud or something.

A lot of the time windows explorer will stop responding completley and has to restart.

Could someone please help me to get rid of this extremely anoying virus.

Thanks