My laptop preforms better then my better desktop


Hello, I have a Desktop PC and installed Evolve on launch. The game runned great for 3 days.
When i changed my Steam name after i unlocked Cabot, The games runs on everythink on low and aa + vsync off in like 10 fps. In a fight it stutters. Also the sound stutters.
I installed the game on my laptop which had a better cpu but worse gpu, it runs good.

PC Specs:
Intel i5 760 2.80Ghz (CPU)
Msi R9 280X (3GB Vram) (GPU)
8 GB Ram
Asus P7P55D-E PRO (Motherboard)

MSI GT683-laptop Specs:
Intel i7 2630QM
GTX 560M (1,5GB Vram)
8 GB Ram

Now is my question: Is it the game or my desktop? Since it runned good the first 3 days.