Unity5 crashes at startup

A week ago, Unity worked well, but now ! I don't know what happened, it just crashes whenever I try to run it : I tried all these solutions:

• Adding the "-force-d3d11" command line argument or "-force-opengl" command line argument in the properties window.

• Reinstalling unity ( I did it a thousand time ).

• Installing unity 32bit version.

• I tried to create a new project ( empty ) and the problem is the same.

• I tried compatibility mode.

• My directx 11 works perfectly

• I deleted the regedit UnityTechnologies folder.

• I runned it in admin mode.