How do I remove sites from my trusted list?

From: Aurora (Aurora_at_discussions.microsoft.com)
Date: 11/01/04 

Date: Mon, 1 Nov 2004 09:15:04 -0800

I am trying to remove sites from my trusted list and add them to the
restricted list. When I go:tools-internet options-security-trusted
sites-sites, the remove button will not come on. It won't let me add them to
the restricted list until I remove them from the trusted list. These sites
keep giving me pop-ups (that I block every time I come on the computer), and
an unwanted toolbar at the bottom of my screen. I had a virus called
trojan.adwaheck, but I removed it, the scan shows no viruses now. Can anyone
please help me? I would really appreciate it ALOT!