Installing Ubuntu One on Windows 7 (64 bit home) hangs after opening two small windows

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http://askubuntu.com – After downloading the Windows 7 install file for Ubuntu One (3.0.2b), I click on the file. It immediately opens two small windows (the console and the ubuntu one installer window) and does nothing else. The console has one line at the top: "(downloads) 1%". I have waited for 30 minutes (while doing other things), but nothing proceeds. Any ideas? (HowTos)