Make like a good soldier and download the new Call of Duty 4 patch (1.3) that's available right now. The patch:
- Fixes the issue which now catches some files bypassing the pure client test. (I don't know what that means either.)
- Set properties so that Anti-lag is always enabled upon map loads
- Optimizes Sniper Rifle accuracy at certain distances
- Text chat between rounds of multiplayer will no longer cut out at the end
Don't just sit there. Get it and fix yo' shizz, soldier.