Hi I have just downloaded and installed shockwave 1.2, but when I go to launch the game it starts but a few seconds in it crashes and dose not run.

In the Command and Conquer Zero Hour data is a file called releasecrashinfo.txt or something. Check this file to see waht is wrong. You can also check the Worldbuilder in the main directory of Zero Hour. The Worldbuilder gets most of the errors.

Can I see the error that you get? It will help me (or other guys on this forum) to solve the problem.

Can you launch vanilla Zero Hour, without any mods at all? It could be a loose external file from another mod.