I have TS12 Dave, but, have so many texture problems and other CMP queries that I'd not experienced before, I was left scratching my head on many occassion. I noted that even though N3V did state that they've obsoleted many old textures, that equates to not being able to run 2/3rds of my PAYWARE content (British, European and American ), from purchases going back to 2006/7, that has left me less than happy. I operate XP 32 bit, so, can't offer any advice on Windows 7 64 bit or otherwise, so, I can only suggest you do a lot of reading on the many threads on this forum. I consider TS12 to be for the multiplayers, it's quite a stable product in that regard, but, has more than enough texture and other errors, so, I've reverted back to TRS2010 for the time being, and as that has compatability mode, at least I can operate my old stuff without having to spend hours repairing it first, or, not utilising it at all.
Pity really, because I thought the built-in TS12 Chinese and Russian routes and rolling stock were fabulous.
Cheerz. ex-railwayman.