Custom built Computer lags in programs and games - Help

These are my computers specs:

Asus M5A99X Evo
AMD FX-8150
A-data 8GB DDR3 2000MHz CL9 XPG Gaming v2.0
PowerColor Radeon HD6870 1GB
1 TB SATA III Western Digital Caviar Blue LX
Seasonic M12II-620 Bronze 620W

When I first built the computer, it restarted itself when I played games and my video card got replaced and still have this issue rarely.

Now many games like Half-Life 1, Portal, Tribes Ascend and more are lagging extremely and I move the mouse and only after 1-2 seconds it moves ingame.

Some games like Starcraft 2, Dota 2 and Minecraft still work.

Blender, a 3D-Program, was working fluidly before and now even when I rotate a cube it lags.

Thank you for your answers :).
3 answers Last reply Best Answer
More about custom built computer lags programs games
  1. Are your drivers up to date for your card? I would start there and see if that doesn't fix it right away. What card did you have in there previously?
  2. I updated my video card drivers and the pc is new built, so it didn't have a previous video card. I unplugged the mouse while playing and replaced it with an older one and the previously named games work well now. -_- The first mouse had it's scroll wheel broken, could this be the problem?
  3. Best answer
    Maybe, i doubt it. Could of been a driver issue with that mouse. If you're going to be gaming steady, this is a pretty decent mouse.
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