when doing a system scan,at the end of the scan it list the results of the scan and looking down the list there are about 20 or more files from c:/documents and settings that say unable to scan next to them,when i right click and try to scan any one of them it says an error has occured during the process,does this have anything to do with in system tray avast icon when i open it on the advanced tab at the bottom it says-here you can modify the list of locations that will not be scanned or tested?if so should i leave everything on the list(advanced tab)there,thanks brian