Updating punkbuster with pbsetup
Patch Problems: First make sure you check page 4 of this guide for details of the latest patch, and install it.
If you have problems, see this 1.50 Patch Troubleshooting FAQ, and remember that your BF2 must already be patched to version 1.41 before you can apply the 1.50 patch.
I then recommend running through the tips on this and the previous page of the guide to genuinely optimize and stabilize your system, as most problems are actually due to things like overclocking, background programs, mods, scripts etc.
If you still have problems and genuinely believe your system is rock-solid, then I recommend completely uninstalling BF2, rebooting, then reinstalling BF2 and then only installing the full 1.41 Patch, then the latest 1.50 Patch on top of that to bring BF2 up to date.
Punkbuster: Battlefield 2 uses the Punkbuster anti-cheat software commonly used in most other online games.
This software helps identify and prevent cheating in the game, and cheaters can expect to have their account banned.
Next, make sure you don't change your UAC settings after the game has been installed, as due to Virtualization this can change the location of the game files and settings.For other problems with Punkbuster, see this BF2 Punk Buster FAQ.In-Game Lag/Freezes: Most people experience a lot of in-game lags, pauses and several-second freezes.However note that you can't alter your account details once created.You'll have to contact EA Games support if you still have account-related problems as only they can rectify genuine account errors.