Sounds like a rights issue.
Are you installing as Administrator or as a user with "Super User" privileges? When did you get the "disk full" error? During the download? After the Unpack? During the install?
I'm in Regina on Tuesday and Winnipeg on Wednesday (and I hope that readers in those areas will come out and say "hello"). Monday is a travel day. Your Adagio consultant should be able to figure out what's causing the problem for you.
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Andrew Bates