Jocamps 14 Junior Poster

Hi everyone,
I used to play counter-strike on my laptop before and it works perfectly. and it has been ages since i have uninstalled it. Now i want to play it again and try to install a new copy and when i play it, the screen goes wild it sort off like a flashing film that goes up and down.

Does anyone know how to troubleshoot this? i haven't really changed any of my hardware components and my laptop works perfectly fine on movies and other graphical stuff (if this is a video card problem).

any help will surely be appreciated. thanks