Random lag spike

So my computer been experiencing lag spike when i multitask, like listen to music mv while on other tabs browsing the web. So i dont know what is the problem that causing the lag, like every 1-3min a lag would hit and everything would freeze/buzz for like 3 sec. Here is my computer specs, and i also wondering if i can change my video card to intel, and what type of video card can i change it to. Since my computer is running a AMD at the moment.

Gateway Fx-6860
OS: Window 7 Home Premium 64-bit
Intel Core i7-2600 CPU@ 3.40GHz
1.5 TB HDD
8gb Ram
Video Card AMD Radeon HD 6750
ManuFacture: ATI Tech
Chip Type: ATI Display adapter
DAC Type: Internal DAC
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More about random lag spike
  1. you have it wrong you video card is different from your processor
    you can upgrade your graphics card but i dont think thats your problem
    did you try resetting your bios
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