whenever i click register i get an alert saying "c is not a valid protocol" what does this mean? and if i hit ok instead the game starts up but then freezes. what the heck is goin on? could someone please help.

http://www.soldat.pl/man/register-en.html

a bit more specific:
Soldat tries to open a webpage, but somehow it fails, because an entry in the registry seems to be missing/corrupt/...
I don't know how to *fix* it. Maybe Michal does.
Anyway, just click the link Lapis Lazuli posted and you will end up where you should by clicking the Register button.