Sounds like the infamous DMA bug. The sporadic mouse movement is the real giveaway.
I won't repeat what has been covered countless times before on these forums, but if you type in something like "DMA bug" into a search engine, you should come across a page or two detailing how to toggle this setting.
So I decided to be super smart and build my own computer. Problem is, it ain't working so well. I have a very slow boot time, about 3 minutes. When I start a program, say Windows Media Player 11 the cpu goes through the roof and the mouse pointer becomes sporadic. I end up having to close the program through task manager. I've looked under the tasks menu while the cpu is at 100% but there isn't really anything else tying up the system (That's shown).
I'm really perplexed because I bought some nice stuff, installed it slowly and methodically, but have slow load times. Games work great, no problems there, mainly just when I start up/use certain programs like Windows Media Player.
The system if free of spyware etc, I've run system mechanic, spybot and AVG. Besides, I've only had it running a couple days and have a firewall running and haven't downloaded anything.
Here are my specs:
Pentium D 3.4ghz DUAL CORE 775 CPU | 800/4M
Gigabyte GA-P35C-DS3R motherboard
Western Digital GP - 1TB
VGA Asus EN9600GT 512MB
6GB OCZ Platinum Memory
Creative Sound Blaster Platinum x-fi
If anyone has any idea I'd be very grateful. I tested the memory, everythings fine. Could it be the bios? Or maybe the WD GP hard drive?