Does it do that every time you try to launch it?
Have you tried rebooting?
What happened with that computer between when it was working and now? For example, did the OS get upgraded? Did Windows update itself? Has anything been installed (hardware or software)?
If you don't want to use CC 2015, have you tried using CC 2014?
When I try to start CC 2014 it just stars CC 2015 and yes, I tried to reboot. Not anything new...
When I try to start CC 2014 it just stars CC 2015
That's weird. I have CS5, CS6, CC, CC 2014, and CC 2015 on my system and I can run any of them without issue.
How are you trying to launch CC 2014?
Also, you didn't answer the most important question. We need to find out what happened between when it worked and when it didn't. Computers don't suddenly decide to stop doing something, so something must have changed. We need to figure out what it is.