I changed my hard drive and re loaded final draft...

Have you contacted the manufacturer of Final Draft, and explained that you replaced the hard drive and reloaded the software? If they cannot (or will not) help you, then perhaps there is a work around. Does your old hard drive work? Assuming it does, I suggest you get a product called Norton Ghost, and clone your old hard drive contents onto your new hard drive, then run from the new hard drive. The upside to that is, you will not lose anything from the old drive. The downside is, if you wanted to reformat or start with a fresh OS, you cannot. But, if your old OS was bug free and ran fine, then there shouldn't be any issue there. You might also just try to copy the customer number from the old hard drive and re-enter it on the new hard drive, (again, i am assuming the old hard drive still works). those are 2 things you could look into.