Windows 7: Problem with Installshield

Hey guys I dont even know how this happened.



I was able to install GTA San Andreas on Windows 7, then I thought of uninstalling it but an error appeared and it looks like this:

An error (-5011 : 0x8000ffff) has occurred while running the setup.

Please make sure you have finished and previous setup and closed other applications.
If the error still occurs, please contact your vendor: Rockstar Games
(Rockstar Games).

Here's also a detail for the error:

Error Code: -5011 : 0x8000ffff
Error Information:
>SetupDLL\SetupDLL.cpp (551)
PAPP:Grand Theft Auto: San Andreas
PVENDOR:Rockstar Games (Rockstar Games)
PGUID417C96A-FCC7-4590-A1BB-FAF73F5BC98E
$10.50.0.125
@Windows XP Service Pack 1 (7601) BT_OTHER 0.0

Uhmm...Can I ever play GTA SA or I'm gonna stop it?