I second Tulrose's question. Can you tell us exactly what you did, step for step?
I've never used FTM16, and I'm at work now so I'm going from memory. But just a couple of days ago I moved everything over from WinXP to Win7 and found the importation process a bit confusing. Essentially, I had to create a new tree, specify import from file (hence Tulrose's question), then browse to my backup file. (It didn't help in my case that FTM12 under XP created files with an .FTMB file extension which FTM12 under W7 refused to recognize; I eventually had to manually rename the backup files to .FBK.)