Keyboard Problem?

My keyboard can't do more than two actions at once. Like if I'm in-game, I can't do CRTL+Shift+TAB to crouch while getting my steam overlay up. And it also locks when i try to do Shift+CTRL+Space to Sprint, and jump crouch. Any ideas on how to fix it

Buy a macro keyboard....

Just google it, I'm sure you'll find an answer lol...

http://lmgtfy.com/?q=My+keyboard+can...ctions+at+once.

USB drivers.
Maybe even ghosting.
Your roll over is not enough.
See if the same thing occurs when using a different keyboard