1 second pause while gaming

[JaKSLaP]

Hey guys

I am having a weird issue while gaming, I am getting a 1 second pause then everything goes back to normal. While playing I will be getting a solid 60fps then it will slightly freeze, drop to 45fps then go back to normal. I checked the HDD led light when I haopens, and the light doesn't come on, cause I thought maybe it's loading something.

I have tried, disabling page file, lowering performance in sound card, turning off various sleep and idle settings in BIOS. Re installing video card drivers. I have no background apps running. 

My system

Gigabyte 81865gm 775, Pentium 4 3.6ghz, 2x512mb RAM, 120gb 2.5" 5200 laptop HDD, geforce 5600 ultra, creative ct4830 sound blaster.