All our products work in Windows 7, without using any compatibility modes. In fact, the XP compatibility mode shouldn't be used at all for Flight sim.
The only important thing to do is follow the "IMPORTANT" paragraph, as indicated on the Cloud9 page here:
http://www.fsdreamteam.com/products_cloud9.htmlIMPORTANT
If the Cloud9 product you purchased doesn't have an FSDT updated installer yet, you have to install the Cloud9 product first, then update the Stand-alone Addon Manager
Since the F-104 doesn't have an installer made by FSDT, it's mandatory you download and install the Stand-Alone Addon Manager for FS9 (link is on the above page) AFTER the F-104, otherwise it won't run under Windows 7.