I don't know why this would ever happen, but for some reason two .dll's in the WINDOWS\System32 directory on my hard disk called aswCmnOS.dll and aswCmnB.dll made me panic when they gave an error for System Restore. When the two files are stored in the System32 directory, I open System Restore and an error occurs. It loads System Restore with a blank screen. Can anyone else confirm this? I have the latest version of Avast Professional (4.1.418) and VPS version 0426-1 (if it really matters). I am running XP Home. When I removed them from that directory, System Restore worked fine.