In games, character spins continuously

When I start up games like modern warfare 3 or The walking dead, my character spins continously. It seems the mouse always wants to be moving to the right continuously.

This is only happening in games. I dont know if its related, but I can't click and drag to select text in the URL bar, but I can click and drag to select text everywhere else in Chrome.

Whats going on and what can I do to fix this??