Tech Help Anyone?

Recently, my arrow keys, which I use instead of WASD seem to be over accelerating.

I hold down left arrow and move left but when I hold down right arrow to move right my character still moves left.

Then after a few seconds it moves right. Its the same for back and forward...

Its like input lag or something?

I have tried everything I know, even using different keyboards, updating drivers and even trying different crossfire accounts.

Has anyone got any helpful ideas?:)