Uninstall the apps that placed them there, or edit them from the registry. Which version of windows are you using? I seem to remember a check box or something to clean up the listings. If you are running win 98 then I am sure your only option is to try my first suggestion. Personally I would ignore them and move on.

<edit>I just looked at your profile and noticed you are using win2k pro, my win2k pro that I am using never has had the msconfig program. Where did you get one for win2k??? </edit>