If you have Tweakui, you can use it to remove those entries...it's free here....I haven't checked the sites lately but there is a version for XP that works as well and can provide a link to it if you find that these sites don't have it.
If you need TweakUi, get it here....then extract the file to a folder and right click the TweakUi.inf file and choose Install. If it asks for the location of the files or requests a cd, use the browse window to get to the folder where the files are located and the install will continue. You must close the HELP window when it appears in order to complete the installation. This is NOT the XP version.
i have a couple of programs that my add/remove in control panel show are still installed. when i use the add/remove function, i am told the uninstallation file can't be found. i erased all aspects of the programs from the registry, and they still show up???