Ok, I thought you had both Avast and AVG on the system. Well, that is one thing solved.
And you can't set System Restore to generate a restore point when a system is IDLE. This is a Windows limitation and has nothing to do with any av.
If you want to have a decent restore option, create a image of the drive(s). This is a much better way than using system restore. What good is system restore if you can't boot? Think of that.