Before I install the v1.1 patch, the game was working fine, but after the patch, the CD was no more recognized and I had to install a crack. But now it crashes after loading the stage...
The menu works fine, but after loading the stage, CRASH...
And before the crack, the game not even starts, only appeared the message: "Insert CD and press OK"

Have you used the correct version of the patch? There are 3 different ones available.
http://wwp.team17.com/main.html?page=comm&area=_down_patc

If you don't want to play online (Wormnet) and don't want to use the mission editor you might not need to patch at all.

Talking about "cracks" to a Team17 game on the official Team17 forum is not only stupid but also not allowed and might get you banned.

FAIL, really want to play wwp online ? Buy it or do something what I cant say without getting banned löl. Oh and throw the wwp out of window and get wa ..

reinstall the game and use the right patch for your region... if you patch with the wrong region you do NOT have to reinstall the game... simply install another patch over the top and try again.

But I bought this game! I'm not a piracy's friend! I have the original disc!
And it doesn't work!!! Why?? I really don't know...
I installed the US version patch, I will try to install the UK patch. But, before: It's really necessary to reinstall the entire game before install the UK patch?
Thanks for the help...

Yes .