Reinstalling a manually deleted game

I have a game on my PC wich missed some files after a system repair and I couldn't uninstall it so I manually removed the game folder, supposing I could just install it again.

Wich is not the case. Whenever I fire up the CD it gives the option to Uninstall, but if I click it, it won't work because a file is missing. Of course the game also won't run so I'm stuck.

How do I solve this?

srrii fur mey batt inglisj

install then uninstall I guess? or if its not much un-do the system restore.

try exploring the CD for the setup file

Thank ye mates, running Setup.exe worked. +Rep to both of ya 

this occurs because games leave entries in the registry about themselves being installed.

and if this topic is resolved can you add [RESOLVED] to the title thanks