Deauthorization

[PiotrSkałecki]

I have a problem with my ArcGIS for Dekstop v.10.3.1. I need to reinstall a program, so I tried to deauthorize my license. And here is the problem. When I checked ArcGis Administrator there was nothing. Here is screenshoot how it looks: 

I downloaded ArcGis deauthorization tool, but the process failed - neither automatic nor offline wasn't working. Do have any ideas how can I fix that?

[JayantaPoddar]

Try repairing ArcGIS Desktop...

[PiotrSkałecki]

Thanks, it helped. Administrator is repaired, but still can't deauthorize. There is an error with the content: 7284:Cannot perform support actions on inactive fulfillment record FID__3572dea0_159bca9bc1c_70f6. [Incident# 1818-55384631]
I checked my license and it's disabled although it expires at 2018... It's a student trial, does it matter?