Answers:
Ya, You can do this.
Go to
C:\WINDOWS\system32\drivers\et...
Open the hosts wallet surrounded by notepad.
Put this at the end column >>
127.0.0.1 www.orkut.com
what is an Orkut?
you can be in motion to TOOLS,(heading), after interent option, afterwards wellbeing, and select trusted sites or restricted sites
I find it easier to use a firewall for your desktop computer if you are not in an department framework. Maybe you can enjoy a look at Tiny Personal Firewall.
http://www.download.com/3000-10435_4-103...
If you are in an bureau or a home see later you can lock it at the router/firewall rank. Talk to your bureau see administrator.