About 3 or 4 weeks ago I started to have some major halo problems. Whenever something is near me, such as a major fire fight, someone driving a hog or any other type of vehicle, more than a few people on my screen, I hold down my vent hotkey, or get a message on MSN, I get major lag and/or terrible framerate. My fps will drop down to 1 or even 0, my ping in the server will start to jump crazily and I will get the DC box, my computer will start to almost lock up as in get extremely slow, and vent will lag until i alt + F4 out of halo and wait for my computer for about 15 seconds for it to catch up and be at normal speed again. This only happens when I play halo, I can browse the web or play other games such as Call of Duty 4 Modern Warfare just fine with the exception of the ocassional fps issue that one would expect when trying to play such a game on GeForce 8400 GS. I have tried lowering my settings to no avail. I have tried a system restore to when i could play it just fine to no avail. I have tried several different antivirus softwares such as IOBit or AVG 8.5 to no avail, no viruses. I have tried uninstalling halo, uninstalling my graphics drivers, restarting, reinstalling my graphics drivers, restarting, reinstalling halo, restarting and trying to play to no avail. I used to be able to play halo on all max settings at 1280 x 1040 resolution when i wanted to, but not anymore. I have used Smart Defrag to defrag, used CCleaner to clean up my registry, and GameBooster to try to boost gameplay. Nothing has worked.
Oh and this does happen in campaign mode too.