thanks very much! but where can i find the moved file?
If you moved it to the chest, then you need to open the chest, Infected Files section to find them. You can find the chest with windows explored but it is a protected area, a) the files names will be different to explorer than the original and b) the date inside the chest is encrypted.
So by far the best option is move to the chest and investigate.
Start the Simple User Interface, right click the avast 'a' icon, select Start avast! Antivirus, once the memory check completes, Menu, Virus Chest, Infected Files. Or open directly, C:\Program Files\Alwil Software\Avast4\ashChest.exe.
Don't touch the files in the System Files section of the chest they are backups of important system files.
If you just moved them as has been said you should have been given the option of selecting where to move them to, if not then they would I think have been sent to the C:\Program Files\Alwil Software\Avast4\DATA\Moved folder, this is unlike the chest in that it is not a protected area and when you run further scans avast will detect again in this location.
