I have an ancient NOF 3 (yup..OLD customer) which was upgraded to 5, and much later to 11, running on XP Pro SP 3 (32-bit) and now wish to migrate to Win 7 Pro, 64-bit. Should I anticipate any hickeys loading 3 first so that loading 11 finds it...or what? Will 11 run fine on Win 7, 64-bit? I ask because I tried to load an older AutoCAD on the 64-bit and the attempt resulted in some corruption of Win 7 64-bit files, so better to ask other advice before charging ahead! I also have 2015, uninstalled, but that's another issue for another day. 11 works fine for me.