system
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Tech, I have been able to suscessfully restore WIN 7 x64 SP1 multiple times with Avast 6 installed.
What I have found out is one or more reboots are required before you see the message on your desktop that WIN 7 has been sucessfully retored. Usually the reboot after system restore is a wipeout. Either the desktop will lockup or the dreaded black screen appears. A hard shutdown via the power switch and reboot usually works but not always. Sometimes one or two more hard shutdowns and reboots are required.
Afterwards I did not observe any Avast anomalies or coruption.
Obviously, Avast is impacting the system restore so this does need to be fixed. I also believe that delaying Avast’s startup till the latest possible moment or disabling startup entirely would also help when doing a system restore.