I've experienced frequent, permanent freezing of DW CC 2015 on the splash screen as it loads up. I have a brand new PC with Windows 10. DW has been driving me mad for weeks, although I had experienced the same issue on my older Windows 7 machine on and off for a year. There's clearly a design flaw in DW which causes this.
The latest "fiddle" that fixes this issue for me is creating a new Windows user account and logging in with that. I then load up DW. After it loads, quit and then log out of Windows. I log in again using my original Windows account and DW should load properly now without freezing.
I have no doubt this is a temporary fix but I hope this tip can help unstick others, if only for a while.
Gary.