Unity 5.5 Crashes on startup!!!

I have tried all possible things…I tried the DEP trick but it says You can not set DEP attributes on 64-bit executables…plz help me. …i m trying for now almost a month to start using but cant…plzz help!!!

Not 100% sure if your problem is the same as mine. nut what worked for me:

rename your scene that unity wants to start-- unity should start with an empty scene then— then go to Project, rightclick:
Reimport all.