Ok on that. I have already changed my password and checked that the game is registered to my account. I'll let you know what happens when I reinstall all my programs.

OK. If I uninstall Panzercorps, will I have to reinstall all the other Campaign games as well?

Yes I get the revolving sprockets. Following this I receive the message 'serial number is registered'. when I press the OK button the program returns to the original New Game/Load Game/ multiplayer screen. There has been no change in the game playability.

Yes. I was able to log in to a PBEM with no problems 24hrs. earlier. Should add that although I am new to multiplayer, I am an old hand at Panzer Korps and before that Panzer General. LOL.

When trying to get on to PBEM, after clicking Multiplayer, I now instead of getting a log in screen, I get a message box saying 'Serial Number is Registered'. When I press the OK button nothing happens. von Czech