Before I couldn't run old games on this computer, but now, even League of Legends doesn't work and it piss me off.

I can go in the lobby, but as soon as I get into a game, this happens.

Someone repost the vid please.

http://www.youtube.com/watch?v=GPni-TTb4uc

How old is the computer?

It could be a video card issue.

By the looks of it, you might need to check whether your GPU is installed properly{if not damaged}, purchase a new GPU or try re installing your machine and updating all of your GPU drivers.

Its pretty new.

This also happens when I try to change my resolution.

The only resolution I can use is 1920x1080