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To configure Internet Explorer to use a proxy over a LAN connection, use the procedure in the appropriate section.

1. On the Tools menu in Internet Explorer, click Internet Options, click the Connections tab, and then click LAN Settings.
2. Under Proxy server, click to select the Use a proxy server for your LAN check box.
3. In the Address box, type the IP address of the proxy server.
4. In the Port box, type the port number that is used by the proxy server for client connections (by default, 8080).
5. You can click to select the Bypass proxy server for local addresses check box if you do not want the proxy server computer to be used when you connect to a computer on the local network (this may speed up performance).
6. Click OK to close the LAN Settings dialog box.
7. Click OK again to close the Internet Options dialog box.

 

Read more at :-http://support.microsoft.com/kb/135982

Every where whether it is an office or school many sites are blocked by the concerned authority.I too have faced the same problem and after feeling the difficulty faces by my friends,I have searched a number of proxy sites addresses which would be able to help you in browsing blocked site like you tube,orkut,yahoo messanger,gtalk and much more.You can find out any one from the below list which could help you.It is very easy to implement also.

here is the list of best proxy sites ever i found….

* http://www.powerscrap.com
* https://kproxy.com
* http://62.193.235.46
* http://62.193.226.25
* http://62.193.236.96
* http://62.193.226.74
* http://62.193.236.100
* http://62.193.245.234
* http://62.193.240.162
* http://www.atunnel.com
* http://www.aplusproxy.com
* http://proxify.com
* http://www.msproxy.net
* www.cacheless.org
* www.diyrollercoaster.com
* www.greenrabbit.org
* www.hybridstormlabs.com
* www.ibypass.biz
* www.ibypass.com
* www.ibypass.name
* www.ibypass.net
* www.ibypass.org
* www.ibypass.us
* www.ibypass.ws
* www.melloyello.org
* www.saselinux.com
* www.mathtunnel.com
* www.the-cloak.com
* www.ninjaproxy.com
* http://proxify.com
* https://www.vtunnel.com
* www.webroxy.com
* www.proxy.org

you can use them to open your orkut or facebook….or anything else….njoy