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?
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). 