My nephew asked me to check his computer because it was slow and having trouble getting on internet. It is a hp with a intel E5300 duel core at 2.6 gig. I tried to install avast antivirus but it would not install. I finally got MSE to install. It took 70 hours to run. It found a lot of viruses and trogans. I then installed avast and ran a boot scan. It found some more viruses and trogans. It took two or three days to run this scan. One file is taking most of the time to run a scan. It is c:windows\syswow64\config\systemprofile\appdata\local\microsoft\windows\temporary internet files\content.ie5\9tz9ymyv\ then a lot of different file names and numbers. It takeas at least 50 hours to run through the 9tz9ymyv file. Would it be safe to delete this file or would it screw up vista. Sorry for the long post.