Hi,
to check for false alarms:
you can boot your PC with a WIN-Bootdisk, and copy the seemingly infected files from the Restore-folder to a user-folder of your choice.
After a normal reboot, you can scan the files with other scanners.
Be sure to use "Scan-all-Files"Mode in the other scanners, and to disable Avast resident shield beforehand.
This procedure shouldn't hurt your Win-SystemRestore-Points at all, but give you some info about false alarm or not.
