Boot into Safe Mode, by tapping the F8 key as your computer powers on, and try accessing Add/Remove from there.
Add/Remove, however, is only a mild first step in the removal of pests. Luckily many tools, and several helpful experts are available to help over in our Security forums. I'll link you to the 5-Step Security Checklist (some of the tools will be XP/Vista specific, so you'll just stick to the tools compatible with Win9x/Me). You'll notice advice for recommended tools to use in the future, as Internet-connected PCs now need to have firewall, antivirus, and antispyware protection. The 5-Step Security Checklist --- http://www.techsupportforum.com/secu...sting-log.html
Best of luck!
. . . Gary