Hi snark,
Welcome to PCHF!
Thank you for the detailed description.
The windows installation normally installs Windows and doesn't interfear with any of the files in other folders on other drives, even with indexing.
Corruptions in files can be caused by many things, normally hardware, but could also be caused by a virus. Even though you have virus software installed on your PC, doesn't mean that you are completely protected from virus's. When you get an update for your anti-virus, these are fix's for known virus's, so it's possible to have a virus on your PC, before the fix has been released, or even the anti-virus program knowing about it.
Soooo, it may be a good idea to follow PCHF Prework on my signature, and submit your
HJT and AVG log back here, to have a member of security check it out for you, just to double check. You didn't by chance note the name of the virus's that were detected by your current anti-virus did you?
And have you had any more curruptions since?
As for hardware, the most common cause of file corruptions is memory. I'm assuming that all your files are being corrupted, since it's not just mp3's listed here, due to the original Windows error you received. You can test memory by using:
Memtest86 - Memory Diagnostic Page
Also, check you HDD for any errors. Go to
My Computer, and right click on
Local Disk (c) and go to
Properties, Tools tab, and click
Check Now under "Error-Checking". Tick both check box's and click
Start.
Now for the real bad news! Unless you have been using a method of backing up your data onto CD, or other storage device, you won't be able to recover your corrupted files.
Just one more question though, what mp3 codec did you install? Some codec can also have some nasty effects too?