Ever since I upgraded to Win10 my games have been crashing when I press Spacebar. I play D3 and LoL. Both of them I use spacebar a lot in so my games crash a lot. It doesn't happen every time, but the times it doesn't crash the screen kinda flickers (Not always, but maybe about 50% of the time). The games crash to desktop. Please help. Never had this problem before Win10.

PC Specs
CPU: i5-2500K
Mobo: Z77X-UD5H
GFX: GTX 460 SE V2
HDD: 500GB