C:\WINDOWS\system32\drivers\etc\hosts
(Of course, if the drive you've installed Windows on is not labelled 'C', make the appropriate modification.)
Add the following line to your hosts file (using a text editor such as Notepad):
127.0.0.1 www.zonelabs.com # Block access to www.zonelabs.com
Understand that, if you make this addition to your hosts file and then attempt to surf to www.zonelabs.com, you're not going to get there.
I should've said that the path I gave was for a standard installation of Windows XP. If you're having trouble finding the file, just search for 'hosts' (without the single-quotes) from within your Windows directory.
Freeware- Easy edit of the HOST file
http://www.funkytoad.com/hoster.htm
OK explain this to me. When I open the hosts file, I already find:
127.0.0.1 localhost
Somehow I don't think I want to block access to this address unless I am certain it wont mung things up.