i uninstalled rtw a while ago and now i want to reinstall it, but whenever i try it just says do you want to modify , repair, or unistall rtw, but none of those options reinstalls it, so i cant play it. then i went to where you can uninstall programs and saw there is a rtw file there, which when i click uninstall it says it does it but it doesnt disappear from the list, what do i do.