Hi,
Thank you for your post.
Is the game patched? If not try here: Patches and Fixes: Crysis Warhead v1.1 Patch - Demo Movie Patch Download Section - GamersHell.com . Also try changing the compatibility setting to Vista SP2. To do this, right click on the launch icon, click properties and then compatibility along the top. You'll see the setting about half-way down.
In case you are running it on a 64 bit OS please try with downloading a Crysis 64bit patch and try while keeping the video settings to a minimum.
Hope this helps. However,if issue still persist please share the exact error message so that we can suggest you further.
Thanks,
Saroj
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