On trying to move to virus chest it says RPC server is unavilable, cannot process
RPC error is most likely correct by this procedure:
Go to Control Panel > Add/Remove programs > avast! antivirus > Remove
Then choose Repair function in the pop up window (Repair).
If this does not help, can you uninstall / boot / install / boot again?
Please, run a full avast! scan to get clean, sending infected files to Chest.
If you can't start an avast! scanning and use the Chest after that, you shoul try to schedule a boot-time scanning:
Start avast! > Right click the skin > Schedule a boot-time scanning > Select for scanning archives > Boot.