The two viruses with the exception of the ones you sent to the chest don't exist on your system.
System Restore isn't a back-up tool and is fallible and may not give the results you want. It would have zero effect on the files stored in it as it is a protected area and system restore wouldn't cover that anyway.
If any of your restore points were infected then if you use system restore and go to a point that includes an infected restore point then you could be re-infecting your system. Hopefully avast would have detected those also and you elected to move them to the chest, etc.
Why did you need to use system restore ?
So I would suggest that you rescan your system with avast, schedule a boot-time scan would be quickest and quite effective if system restore placed items back in the system folders. Or an on-demand thorough scan longest.
