1 - It's a hardware issue, you can't do anything about this, but you can switch your space to another button by using some key remapper or buying a modern antighosting keyboard;
2 - Are you running W:A as admin? (Windows 7/8) Don't do it. Have you Installed the lastest update (3.7.2.1) ?
By the way, don't install your game in the 'program files' folder, install it in the default directory! (C:\Team17\Worms Armageddon). Otherwise you must run the game as admin.