Hello PakiraAisaka... well we've determined, after looking at
Minimum Requirements for Splinter Cell: Conviction, your motherboard and video card are not supported by Splinter Cell Conviction, and if it's not supported then it (most likely) won't work. Having unsupported hardware doesn't necessarily mean that it won't work; it means that Splinter Cell Conviction does/will not recognize your
particular hardware, and sometimes (just sometimes - tiny %) it will use an emulated driver for your hardware and it will work, as in your case according to your previous post "It should be working, it was working before I reinstalled windows"... you just have to get lucky. I don't have any suggestions for you because your PC has too much hardware that is incompatible with the requirements for Splinter Cell Conviction, except: next time that you buy a game be sure to look at the Hardware/Software requirements to ensure that your PC meets these requirements.
Ordinarily I would suggest contacting Ubisoft Support or the Ubisoft Solution Center, but (in your case) because all your hardware
is not supported, Ubisoft Support
cannot help you.
Good luck.