Although I really like the Trainz product, namely TR2006, right now I can sympathize with the OP.
In the three days since I decided to take the plunge and "upgrade" to TC I've easily spent twice as much time getting it to work with my earlier TS2006 content or recovering it from catastrophic crashes, than I have using it.
Perhaps I am being too judgmental but I think the content that is included with the TC package is sub par when compared to much of the content available for 2006, most of it free. A bad marketing move there, I think, for an upgrade. Additionally, when I do finally get to drive some routes, I have yet to notice any significant changes in the new version beyond working ditch lights. The only change that makes itself impossible to ignore is the fact that I am now spending another few frustrating hours while I re-import gigabytes of content because TC lost it's database and refused to start again after the last crash.
It's getting hard to stay positive about the product. :O(