I have a similar problem, new computer using Windows 10, old version 7.0 that was transferred to new computer using a program to transfer all programs & files. TMG will open, but I cannot open my data files. All I get are lots of error messages. I do have the CD & SN, should I re-install it? Will that "unlock" it? I really want to stick with TMG. I have so much information in there that will not transfer to any other software.