Getting multiple problems with Windows 8

My computer is losing its functionality at an alarming rate. Well, my computer is not old yet some parts just stop working suddenly. A few days ago, the Windows button stopped and just the other day, I could not open pearls. Two days later, I could not access PC settings. When I open cmd as admin, I am not given access to UAC since it regards me as a normal user. I have Norton antivirus that is paid and a Windows 8 OS that I bought. At present, I cannot uninstall any app from my computer. What is wrong with it? Could this be a problem with Windows or Norton? Assuming it is a virus, is there a way to get rid of it and save my files?
