S Key not working in games anymore

So I wanted to go and play some Guild Wars 2. When I logged in, I couldn't walk backwards. I looked in the settings, and back was bound to s like it was supposed to be. I changed my keyboard, but it still didn't work. So I thaught it might be a glitch with the game and went to play planet side 2, only to realize that there the s key didn't work either. The only time it would work is if you type in the chat box. It also works in every programm but games. I tried running my pc in safe mode, but it still didn't work.

Games where the s key does not work:

Assassin's Creed 3
Planet Side 2
Minecraft
Guild Wars 2
Portal
League of Legends
And probably every other game I were to try.

All my drivers are up to date. 

What can I do? Should I refresh my pc?

I am running Windows 8 64 Bit

Any help appreciated.

"Windows 8".

Well, there's yer problem right there. In all seriousness, Windows 8 does have a lot of issues. I'd advise you to switch to W7 for a while if you have it. At least until they release a Service Pack for 8.

Yeah, I agree, but I don't think that it has anything to do with win8 at all. It is probably some software I downloaded, but that woudn't really make any sense since it should then work in safe mode... I am so clueless :(

switch over to the arrow keys