I reinstalled AVG 9 last week and now have files called $AVG on both my hard drive and external drive which I cannot delete. I found a couple of forums where people have had a similar problem and the solution offered was to reboot in safe mode and delete from there. I tried this but it would only work after I disabled the avgchsvx.exe process through task manager. However when I rebooted, the folders re-appeared. The files that will not delete (disk full/write protected error msg) are avgcchff.dat and avgcchmf.dat video cd movie files?? By the by, I only noticed them because my comodo defense+ program has started acting up checking every single process the pc tries to run, which I know comodo is wont to do initially, but I have had it installed for 3 years now, in which time it has managed to 'remember my answers' sufficiently to no longer be obtrusive, until now. I was wondering if the 2 are linked? Maybe the $avg being evidence of a virus affecting comodo? I have run avg and housecall with no results, bar the usual tracking cookies. Any ideas?