Ok, so i can get to any homepage of wikipedia but as soon as i try to do any type of search the schools filter (barracuda, i think its spelled that way) stops it. The computer is mine and i have never used privacywant as a proxy before, and i searched through the registry a little bit trying to find something and didn't find anything on it. And as far as i know its not blocked any where on campus, i dont know if there is a setting im missing that might have gotten changed due to spyware or virus, but i tend to keep my pc pretty clean.
You probably need to ask your IT helpdesk, they're the only ones that know how the filter is set up.