onthe icon in the task bar and avast will not start with the Message "the aavm has detected a RPCerror"
RPC error most likely are correct by this procedure:
Go to Control Panel > Add/Remove programs > avast! antivirus > Remove
Then choose Repair function in the popup window (Repair).
If this does not help, can you uninstall / boot / install / boot again?
and will not open if you go into the menue. If you click on the desk top icon it say " PROGRAM COULD NOT GET STORAGE"
Storage problems are generally solved when you repair your installation.
If it does not work, download avast External Control (see the link in my signature), change the storage method from ODBC to XML (you can do it manually if you want, see 'Settings' on my signature).