Access Restricted Sites And Internet From Lan Office School college!!!

How to access the protected and so called phished out sites in a college subnetwork or office subnetwork....ALso access the GTALK and Yahoo and any messenger and chatting softwares....? lets say that ur behind a firewall in a lan subnet in which ur college school or office provides u internet but with restricted sites...that is u cant open any other site except those allowed.... Download a software from this site .... http://www.ultrareach.com/downloads/ultrasurf/u.zip (tested TROJAN FREE) its called ultrasurf !!! see how it works... u just have to extract the exe file outta zip file....then run the exe file...it will automatically detect ur network and router or proxy server...theere are 3 bars which will be flooded with connectivity indicators....now ur free to access anything.....just change ur browsers ip to 127.0.0.1 and port to 9666 and u can access anything....works for chat softwares too..like gtalk and yahoo