What is happening to my pc? (cont.)
(1,200 char. limit, caveman speak.) Week ago, Turn on pc, login, welcome screen takes long time to pass (15 seconds), windows.exe no work, run Ccleaner, registry errors fixed, pc works fine. Today, turn on, login, works fine, go online for hour to do school work, system shuts down for update, restart, "preparing for system update, do not turn of pc" screen is stuck for hours, restart, safe mode, system restore failed, restart, normal mode, same thing as week ago, restart, safe mode, Ccleaner no help, antivirus programs no detect anything, Norton Power Eraser doesn't detect anything. HELP!