Whenever I try to start Crysis Warhead, it tells me "the game is not able to start properly, please re-install your game"...please help!

I figured it out. I had to disable my security protection.

Good to hear you resolved the issue. What security protection are you using?

I have "Secure-it" protection through my cable provider. I thought I had it resolved because the game was playing great. After I got done, I turned my security protection back on, tried to launch the game, and its telling me the same thing...."the game is not able to start properly, please re-install your game". Something in my security program is messin with it! Got any suggestions?

Yep, get rid of it

I use Microsoft Security Essentials on my main rig. It's excellent, free, requires no registration... and it's from Microsoft, to protect their operating system, so it's pretty good