How to fix "AVG gets stuck scanning "c:\System Volume Information\*.*""

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 knowledgebase arrticle
How to gain access to the System Volume Information folder
In summary
cacls "driveletter:\System Volume Information" /E /G username:F