Thought I'd also post this as I also have the same problem
http://www.theeldergeek.com/pci%20and%20ntfs%20dot%20sys%20errors.htm
Haven't tried it myself yet, but its an alternative anyway (anyone know if this is actually right/wrong?)
Also when the problem originally came up my local computer company told me it was the W32.gaobot, a fixtool for which can be found on symantec's site. The problem has since come back for me (and the fixtool doesn't detect the virus, hence I believe the company lied to me!) , but it may be correct for someone else
Hope this helps
