Hi, found this forum via google, hope somone can help me. I got a 'critical error' message comming up, it says: 'Attention, ! 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 dowload the antispyware.' If you click ok it takes you to a site for some free virus scanner. Also, if i am in a folder and i click 'up folder' or 'back' that is when i get the message. I have used the programs i have and thay found nothing. Hopefully someone can help me out. Im running Win xp sp2.