I think the problem may be that your host name has 8-bit characters in it.
This appears to be a bug in updatetool.
If that is the case and you are the adventurous type you could try this
code level fix:
Make a back up copy of:
"D:\glassfishv3\updatetool\vendor-packages\updatetool\gui\application.py"
Edit application.py and change line 87 from:
host_config_dir = os.path.join(config_dir, socket.gethostname())
to:
host_config_dir = os.path.join(config_dir, fsenc(socket.gethostname()))
Try to run updatetool again.
Hope this helps.
Chris
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