Create the following key in the registry and change restricted.com to the actual top level domain of the site you want to restrict. This will disable the ability of that website to install software on your computer. [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\restricted.com] Under the sub-key create a new DWORD value called "*" and set it to equal "4". Restart Internet Explorer for the change to take effect. Note: This setting can also be applied on a user-by-user basis by modifing the same key under the HKEY_CURRENT_USER hive. I would like to create .reg files to do this automatically for web sites known to install Gator and comet cursor and other nasties. Could someone here possibly tell me how to figure out which sites to include in this list?