Game getting random fps spike lag every 3 secs?

So, my computer and when I played games was working perfectly, was running very smooth. But now, it has a spike FPS lag very 3 seconds and I'm about to strike my screen with my fist. Please help! :D

(Just try to help, don't post me about buying anything else.)

Specs:
Processor: AMD Sempron(tm) 140 Processor 2.70 GHz
RAM: 3.00 GB
System Type: 64-bit Orperation System
Video Card: ati radeon hd 4350

;(
4 answers Last reply
More about game random spike secs
  1. Hi :)

    Virus ?

    All the best Brett :)
  2. I don't think so ;S

    Scanned my computer with the following:
    - AVG
    - Microsoft Security Essentials
    - CCleaner
    - McAfee

    Not sure though ;S
  3. So my game is running smooth but every 3 secs my fps drops from 150 to 30 then goes back up to 150 in less than a second. It repeats it over and over and over...
  4. Check your CPU & GPU usage and temps
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