Is FS9 compatible with Windows7?

When FSX aooeared, I decided to stick with FS9 because I found it an excellent platform for my purposes. I created a three-screen cockpit which worked fabulously with Windows 7, but somewhere along the line the computer downloaded an update which screwed up my ability to access the program. I kept getting notices to log in as administrator, but when I tried, the program refused to open. I finally gave up and went back to XP and one screen, but I'm not about to throw away all the work I put into the cockpit. Is there a compatibility issue with FS9 and Windows 7? How do I work around this?