Did you permit opening port if you use firewall? If it's blocked allow
opening port 9090 and 9091 and
kill/terminate NXT.exe and rerun it at NXT.app\NXT.exe. And though it
may run on non ascii character
path, I highly recommend C:\NXT.app or D:\NXT.app style path. If
problem is not solved, please let me
know again and I'll retest it at Windows XP.
Thank you for your interest.