Unknown MSTS Issue

Can somebody help me. I downloaded something from Train-sim.com and installed it in my game. But now it wont let me play becuase it says it cant find "csx789.eng file". But the problem is, is that I never installed that unit no any units for that matter. Is there anyway somebody can help me?

That probably means you downloaded an activity that involes said unit. So, you have to go back to train-sim, and read the read-me. And in addition, search for the unit.

I searched for the unit on train-sim. It said no such unit is in its library. In addition, I had only downloaded freight cars and read the read me's. They all just said put it in the trainset file and run a consist.

My MSTS stopped working recently. I have uninstalled it and re-installed it several times and even tried another copy of the software I own without any luck.

I can get it to launch the screens but fails as it is about to go to the route selection menu. Anyone have this happen to them?

Thanks!
Gary