Unable to install printer

>-----Original Message-----
>I'm using my computer to distribute my cable internet to
>two other computers. I'm trying to install a new
printer
>on my machine and cannot. When I select "add a printer"
>the response is "Operation could not be completed".
When
>I try to use the Add New Hardware Wizard the response I
>get is "RPC server is unavailable". Any help or advice
>would be valuable.
>.
>
I'm getting the same message: "RPC server is
unavailable". I'd also appreciate some help, because it's
confusing, and I can barely find any information about
RPC (maybe I'm looking in the wrong place?)