Unity3d Crashed when i import pakage..

http://prntscr.com/1zl2t8
When I import or (re)start Unity3d I get this message.
How I can fix it ?

Sounds like you have a corrupt project/asset. Hold down Alt while Unity loads to select a different project, or create a new one. If that works, you can import the assets from your broken project one at a time to see what’s knackered.