I bought my computer less than a year ago from Best Buy and after 30 days I bought it I notice serious lag, sound crackling, and sound buzzing at the same time. This happens when I am playing "demanding" games suchs as fallout 3, crysis, call of duty 4, bad company 2 etc.., though it happens more in game than the other and it sometimes happen when I am just listening to music. When I go into event logs, there is no log on the problem that I am having during the time of the incident.
I think it is a hardware related problem because a few months ago, I reformated my computer to see if it was a software-related problem but it was not. I know that it's not my video card because I used 2 different video cards and the problem still occurs. The whole thing started when I installed Bad Company 2 in the first place but I don't have it installed anymore. my computer is still under warrenty but Acer won't just let me send it the computer without me telling them the problem, but I don't really know.
The only thing I can think of that's causing these very annoying problem is Windows 7, my motherboard, my power supply, ram, my processor, and/or computer dust.
Computer specs: Acer M5802 desktop
Windows 7 Home Premium x64
8 GB DRR2 RAM
Intel Core 2 quad Q8400 2.66 ghz
750 GB HDD
*Nvidia Geforce GT 220 1 GB* (OEM)/ ATI radeon HD 5770 1 GB
*NOTE* the GT 220 came with the computer.