During the scheduled scan of the computer, AVG stalls on the
directory "c:\System Volume Information\*.*"
It just ticks over the time on the scan, no CPU time is charged.
This directory is protected against reading in Windows. You can
look in there if you reboot in safe mode.
You can change the protection according to the Microsoft
How to gain access to the System Volume
cacls "driveletter:\System Volume
Information" /E /G username:F