I am sorry but i got a bit bothered by the comment that a proxy will hide you. This wont work because the requests you are making still need to pass trough the local network and your admin is god on there, and can listen in on any traffic you are sending. The one way you might be able to do this is to build a encrypted path to a proxy and i don't think any free proxys that provide that service but i could be mistaken, maybe somebody can slap me down if i am wrong.