Problems with gta san andreas

Hello,
i have tried to delete the folders of rockstar and all will go but the one folder in the add/remove programs i have tried to delete it and change it,but it always comes back to the "do you wish to remove all " and i click yes and the folder never leaves? wtf am i doing wrong, I do have vista,(and no comments about get a new os this one works just fine,and this is the first problem i have had with it,so) also when i try to re load the game it says the same thing as if i was trying to uninstall even if i click install or setup.exe files? how can i get rid of the stuck folder?