1st problem!!!!!!!!!

os: xp
download from: http://arma2.nexway.com/index2.html?..._IT&REF=671797
lang: ITA
patch: 1.02


I was practically playing in multiplayer when the PC crashes and restarts ...
I try to reboot to start but after Bohemia screen, tha game crash to desktop with this error "bad serial number given in setup" !!!!!!!!!

looking in the windows registrythere isn't the environment variable that contains the CD-key.

reinstalling the game everything go correctly. it's already the second time that reinstall the game...

how can I do? you will know nothing?

thanks in advance.