Have physical backup of old computer; trying to import physical bookmark file into new computer's FireFox folder; impossible to find it and Xmarks has failed me.

I had an older laptop running Vista, and the Hard drive started to die. So I made a physical backup copy, and upgraded to a new machine running Windows 7. After downloading Firefox onto the new machine, I was unable to restore my bookmark backup from Xmarks (for some reason it just would not work, and I've already been talking with their tech support). I was wondering if it's possible to grab the physical bookmark folder/file from my old computer backup (as I backed up pretty much everything from the old machine) and just slip it in the new Firefox folder. I am currently running Firefox 5.0.1; I believe I was running the same version on the old machine as well.