I installed OS X Mavericks from the App Store, but after it installed, it kept booting for about 20 minutes. When it finally booted the mouse cursor kept spinning for about 2 hours and then I rebooted and it did the same thing. I went back to OS X 10.6.8, in which I am now, and it runs fine. Should I update to Mavericks again or should I stay in Snow Leopard? Thank you in advance! PS: Sorry for any grammar mistakes, I am from Albania!