Unity freezes when i try to open a project

The title says it all. When i try to open a project it freezes.
It also takes an INSANELY long time to launch (I think it takes 10-20 minutes to launch).

I have Unity 2017.1.3p1 and when I open my project it opens unity but its all white and my task menager says NOT RESPONDING if anyone has a solution pls post it