- Infected Restore Points:
There really is little benefit in chasing a detection in the system volume information folder. It is only there because it had previously been deleted or moved from the system folders and this is a back-up created by system restore.
- Worst case scenario it isn't infected and you delete it, you can't use that restore point in the future, not much of a loss and the older the restore point is the less of an issue it is.
- So if there is any suspicion about a restore point then it is best removed from the system volume information folder or it could bite you in the rear at some point in the future when you use system restore if it included that restore point.
Though why you (avast) are unable to delete it you don't say, what error message is given ?
I suspect that this may be inside an archive file in that restore point.
####- The C:\System Volume Information folder is a part of the system restore function and as such is protected by windows, the only really effective way to clean infected _restore points is to disable system restore and reboot. This will clear ALL _restore points. Once you have disabled system restore, reboot, scan your PC again and if clear enable system restore.
Windows XP - How to disable
http://www.howtogeek.com/forum/topic/how-to-disable-the-system-restoreWindows Vista, win7 Disable System Restore
http://www.howtogeek.com/howto/windows-vista/disable-system-restore-in-windows-vista/.