Like many I couldn't even get the new Lightroom CC started. I'm a Mac user but I'm sure it should be the same on PC. I signed out of my CC account. I then started Lightroom CC, it failed a couple of times but then I got an agreement page to click on, then it went to Creative Cloud sign in page, did that and hey presto. Lightroom worked. Still don't think I'll be using it. Compared to Photoshop I find it so complex. Hope this helps.