When opening, Unity won't load until I terminate a powershell process

When I open Unity, I see no apparent activty. UnityEditor is in the process list, but the project selection screen is not visible.

What I found out is that I need to terminate a powershell process that spawns with Unity and once I do that, the splash screen shows and Unity actually loads.

If I open multiple Unity instances, I get multiple powershells and I have do to the same thing.

Using Unity 5.4.2f2

Cheers!