[Error: 2 - The system cannot find the file specified]

Adding more information.
Under Registry Editor I went through HK_LOCAL_MACHINE -> SOFTWARE -> Wow6432Node -> Microsoft -> Windows -> CurrentVersion -> Uninstall -> Counter-Strike 1.6 Warzone Original
and there are 3 things.

(Default)
DisplayName
UninstallString

and when I click modify UninstallString it gives me this: 0:\Games\CS 1.6\Uninstal.exe

[Error: 2 - The system cannot find the file specified]

Hey, I'm 15 and not that experienced at computer fixing but pretty good f***ing it up... I recently tried to install cs 1.6 cracked version from piratebay and turned out it was trash file. I does nothing really, but I would like to get rid of it, just so I could install cs 1.6 again, but not junk this time.

I can't remove it from Control Panel and I try to use CCleaner now, but when I try to remove it under "tools" tab it says "Error: 2 - The system cannot find the file specified

Is there someone more experienced and could help me please?
I hope that's enough information, oh and when I try to uninstall it under Control Panel, it says "You do not have sufficient access to uninstall Counter-Strike 1.6 Warzone Original. Please contact your system administrator."