Creo will not open

I am running Windows 10 and have Creo 2.0 installed on my computer and it will not open. I run it, I run it on administrator, but nothing happens. The cursor "thinks" and then nothing. I also try to open ModelCHECK, Structure, and Thermal with nothing. When I open Structure, it does tell me there is an Unknown licensing error 26. This has been going on for the past several weeks, usually after I restart my computer. After about a day after the restart, Creo will open again. What is the problem here? I am losing valuable time.