I started up my computer today to find that all the programs on my window's taskbar are gone, along with the windows file explorer. I cannot even open the start menu to shut down my computer, so I have to manually shut it off using the power button. I also found that my computer would shut down, however the power LED along with the HDD LED would still light up (and I can also still hear the fans running). I would have to wait a while for the computer to fully shut down. Restarting the computer has led to no success. Help?