Mouse problems in Counterstrike

Ok I've got a random one for ya.

In Counterstrike 1.6 my mouse sticks constantly when I am looking around. It only occurs if I am holding down 'a or 'd' while looking around, and it sticks/chops across the screen, barely moving at all.
It also does not do this in any other games, like it works fine in tf2.

I have tried switching mice. No dice.
I have tried switching keyboards. No dice.
I have uninstalled+reinstalled cs. No dice.
I have tried uninstalling+reinstalling the drivers for both the mouse and keyboard. No dice.

Here's the kicker, it works fine on single player.
Please help me.

theres a strafe option you need to turn on/off i wish i had it installed still.... i totally know what ur talking about though. just look through all the options, it might be in an advanced menu.

and source is ****.

Yea I don't know about this strafe option. I don't see it anywhere in settings, even in advanced.

OMG I HAVE THE EXACT problem like when i dont move like use wasd and move my mouse its fine but when i move my character my mouse freezes! and its only in cs not enywhere else!! i need help!