Mathematica 10 will not open on my computer which runs Windows 8. It is stuck on the initializing kernals screen regardless of whether I try to open the program or open an old document. The problem only started today (9/4/2015) and prior to this was working perfectly. Desperate for a fix because I need to do a lab
I had this same issue and followed the instructions in this post: Front end freezes on start-up
i.e.delete paclets file and disable auto-update. It's dirty, but it fixed the issue in that I can now actually use mathematica.