File Sharing Will Not Enable

Hello. I have been trying to figure this problem out and have had no luck.
I have searched but have found no reference to anyone having my problem. I
am running Windows Vista Business 32bit. When I go to the network and sharing
center and click on file sharing, I choose "Turn on file sharing" and then
hit apply. The problem is that file sharing stays turned off. There is no
error display at all. I am at a loss of what can be causing this.. Network
discovery is turned on. If i try to turn on public folder sharing I get a
error that says "The RPC server is unavalible". I can turn on "Password
protected sharing" and "Media Sharing" with no problem. With those turned on
I still cannot turn on file sharing. Thank you all in advance for any help
you can provide.

Jeremy Thomas