thorhallsdottirk
Could your license have expired?
2012 + 3 years = 2015
Viewer mode means you are not actviated. If you are in viewer mode, when you start, does it ask to activate?
Go to our activation page. This usually helps.
http://knowledge.autodesk.com/topics/installation-activation-licensing/activate-register/manual-acti...
You may be unable to activate 2012. The student activation is for 3 years- and if you were a student now, you should be installing 2015, I think. Still, try the activation link.
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David Dembkoski