Take the network cards out of the comp aswell, and hide them, along with all the cables.
Get a decent firewall on the comp and you should be able to block specific websites (using their ip), also close the port yahoo messenger works on.
Net nanny i believe can be used as a software approach to the problem.
Here is another solution i read:
Open Windows Explorer.
Browse to C:\WINDOWS\system32\drivers\etc.
Find the file named "HOSTS".
Open the file in notepad.
Under "127.0.0.1 localhost" add 127.0.0.2
www.website address here.com. So, if you'd like to block
www.website address here.com, the code will look like this:
127.0.0.1 localhost
127.0.0.2
www.website address here.com
The site is now blocked.
If you want to block another site, just repeat the process with the next number in the 127.0.0 sequence. For example:
127.0.0.3
www.website address here.com
127.0.0.4
www.website address here.com
Hope this helps
