Go to start->run type cmd.
Now type ping
www.orkut.com (space between ping and www)
You will get an ip address for
www.orkut.com note it down.
Now go to
http://www.allredroster.com/iptodec.htm
Enter the ip in the enter ip address field and press calculate.You will get an address in Decimal field.This is it.Copy this address and type it in your browser,if lucky
www.orkut.com or any other blocked site for which you do this should open.
For example,for orkut you get the decimal address as
http://1208930645