not getting right performance

Gracodana

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This thing seems to happen randomly, my system is a msi TF gtx 760, i5 4570, 8gb ram and asrock B85M pro 4 MOBO.
The effects are in games I get fps jumps in tomb raider from 50 to 7 when I normally get 30 to 50 changing game settings doesn't make differance to fps at all and a new thing that has developed on bioshock infinite burial at sea is that I move as if i'm tapping the wasd keys when i'm holding them in( there is no fault in the keyboard).
I have a W.D. scorpio 750gb hard drive with just under 300gb left. this shouldn't affect performance but I did run a defrag and that helped for a while.

I am really desperate and would really appreciate a reply, thanks
 

Gracodana

Distinguished


vsync and anti-aliasing isn't my problem one day tom raider works at 30 to 50 some days it's not plus I put every thing down to the lowest and the only thing that changed was the look of the game no performance increase that was in any way noticable. this is even happening in minecraft! a 1000 euro rig is getting lag in minecraft!