Can't restore files from virus chest with avast! antivirus?

I'm using avast! free edition right now and I have two items I'd like to restore from the avast! Virus Chest. The items are: kernel32.dll and wsock32.dll. However, when I tried to restore them, an error occurs and it says, "The process cannot access the file because it is being used by another process." What should I do?

Can't restore files from virus chest with avast! antivirus?photoshop

well, either kernel32.dll and wsock32.dll already exist in your system and used from windows so you can't overwrite them, or Avast don't allow to restore kernell32.dll and wsock32.dll cause they already exist.

Reboot in safe mode and try to restore them.

Just tap rapidly F8 while you reboot your PC AND CHOOSE SAFE MODE, from the menu you see on screen.

Then restore the files.