If you registered your copy of TS2010, your serial number will be up on Planet Auran. Log in to your Planet Auran website, and view your serial numbers. If it is there, copy the serial number (highlight) and press Ctrl+C to copy.
When prompted for the serial number, on the serial number tab in Trainz options, press Ctrl+V to paste the serial number. This will save typing all the numbers and letters again.
Also if the program was crashed, due to powering off, you may need to do a database repair. Run CMP and choose Quick Database repair under File.
Do not touch the computer while this runs. Let it do its thing. Usually when I am updating, (installing patches), or performing a database repair, I either do this at night and let it do its thing, or I go off and do something else and let it update.
The process can takes some time, so you need to be patient. When shutting down Trainz, wait for at least 5 minutes before turning off your computer. This gives the program's underlying utilities to shutdown completely and close the database prior to turning off your computer.
John