RPC error is generally related to other antivirus present or, at least, firewall blocking. Do you use a firewall? Which one?
Anyway, 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).
Do you have any other antivirus installed in your computer?
Did you have in the past? Which one?
no. The Norton anti-virus had been installed but since she graduated 5+ years ago it no longer worked properly so I installed Avast. Norton no longer appears on the installed program list in Control Panel. Who knows if all the registry components are gone too. =/