New install not reading previously installed routes

[optimizer]

Not sure how to explain the issue. But here goes.
Before my computer crash, I had installed many 3rd party routes and assets. These were located on a separate drive from the C:. So when the computer crashed, it did not effect the routes stored on the other drive.
I now have my new computer up and running. But I can't get Railworks to read any of the routes that were on the other drive. I even had Steam install Railworks on the drive with all the 3rd party routes. But none of the routes appear in the game. What do I do? Do I have to reinstall all those routes again? I don't even think I have the original install files. Surely there is some way Railworks can read the files.
I hope my explanation is clear enough to express my problem. Thanks for any help you can give.

[Alpenfreight]

Railworks will only read from files that are actively in the install directory. You will want to move everything from within your Assets and Content folders to the new Railworks install. Everything should show up then,

[buzz456]

Just to make this clear make sure when you do this that you don't end up with a Content folder inside the Content folder. It needs to look like RailWorks\Content\Routes and then the routes. Same with the Assets.

[optimizer]

Thanks for the feedback. Problem solved.
However, I notice that many of the thumbnail pics of the routes or assets do not appear; only a circle with a line through it. Is there anyway to get those pics back? In what file should they be in?