In case of no uninstaller, you might need to remove registry entries if this creates errors popping up:
Open windows explorer and search program files folder for the game or mfg. of it. See if it has an Uninstall.exe in it, if not just delete the whole game folder. It may also have saved parts of it in Documents and Settings\<your user name>\Application Data, delete any you find there as well. Go to Start, Programs and delete entries by right click the shortcut and choose delete.