QB 2007 Contractor (CAN) & Vista

I have a client who is running QB Contractor 2007 Canadian on a Vista Home machine.
I can't get the navigators to work. I keep getting messages saying
that Windows doesn't know what to open the file with. AND when I shut down I get an error message.
I have set up the program to run in XP Compatibility mode, the only user is the Administrator and it is installed in the Documents directory. Nothing is working and I've had the damned thing for a week and I am SOOO frustrated.
I'd install XP on his machine but he gave me two XP Home disks and no keycodes...
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