You have admin privilages then its very easy to allow access. Can you tell me what type of admin privilages you have there ?

Ok.. since you can install software .. then try this :
http://www.http-tunnel.com/html/solutions/http_tunnel/client2.asp
Its a free version, have speed restriction but you can atleast visit that site.

Otherwise you can try google webaccelerator, if that worked then you can surf without problem of speed.. anything .

Though there are many ways to bypass restriction.. first you try above and please do configure it properly.

we can always discuss

Google webaccelerator can be found here :
http://webaccelerator.google.com/

so . those sites are blocked..

hmm..
Can you tell me that internet connection which you are using is Proxy based or NAT based ? (if you donno NAT then just search for its details (its call Network Address Translation)).

Ok.. seems you are in harder situation as you are on proxy based internet.

Google webacclerator will not work in proxy based environment.
hmm.. other way around is too technical ..
Best solution is you try some proxy server which can tunnel information through HTTP ..

There are few more services .. like this one :
http://www.hopster.com/
Also..
www.onspeed.com but on speed do not offer free service anymore !
Also there are many software available :
You may have to try one by one. :
http://www.brothersoft.com/downloads/bypass-firewall.html