Why won't it start?!?!?!

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Problem 1

Problem 2

Both

[coastgaurdcutter]

1) I have Steam and bought SSE and all DLC, and I downloaded it on two computers. It works on one and won't start on the other. HELP ME!!!!     

2) Also, I keep trying to go on multiplayer servers and the only one it lets me in is VSTEP Official Server 10. For the others it gives me a variety of error messages such as; Your key code is not registered at SSE Forums, and ( This server is from a newer version of SSE. PLEASE HELP ME!!!!     

[jim.smith]

You can only play on one PC at a time.

[Rbsanford]

1) I have Steam
2) For the others it gives me a variety of error messages such as; Your key code is not registered at SSE Forums

since you have the Steam version, you have to enter two key codes in your forum profile.