The crack supported on GCW works fine (Commandos 2 v.1.0 - ALL - Fixed EXE), I've downloaded and installed on a Win98 machine. I think that there's a problem on WinME, because I've tried to install it on a computer with that O.S. and I always had problems...so, try to re-install it on a Win98 (possibly Second Edition) and apply the patch. It must work.
Hope that this can help.

Robaerus