I cant play worms 4 mayhem , when i click on launcher then i click play a message shows up:
PROTECTION SYSTEM
application installed succesfully. Reboot the computer to complete the installation. continue?
then i click on yes and the computer reboots but then i click again and the same thing happens the message show up again ... i tried many times and still not working
please help

I don't know how much I can suggest...

What I'd try first would be not to click "yes" next time you start Worms 4, instead reboot your computer manually. If all else fails, delete Worms and reinstall it.

Are you on Windows 7?

Try updating the copy protection drivers (http://www.star-force.com/support/drivers/).