Strange errors
 

i took a long break from fiesta and im getting the craving to play again but i cant because when i install it says i need to remove the earlier version of the game, i thought not an issue, just go to control panel and remove/uninstall the program called " Fiesta " publisher " Outspark " but when i try to remove/uninstall i get the really strange error message and it wont continue with the uninstall, leaving me with an uninstallable version of the game thats broken and outdated
it reads-

Error Code: -5001 : 0x80070002
Error Information:
>SetupNew\setup.cpp (150)
PAPP:
PVENDOR:
PGUID:
$15.0.0.498
@Windows Vista Service Pack 0 (6000)
IE Version: 9.10.9200.16576

i have searched my computer and deleted every trace manually but it still will not work
if anyone can help it will be greatly appreciated :)