Five days ago, I did a "clean install" of Windows 8. I have only BitDefender Windows 8 Security Antivirus installed, plus MS Office 2010. Five days ago, I had the same problem - NOTHING WORKS. It started the very next morning after a "refresh" of Win8. When I got to my Desktop screen, there was a message, "Outlook encounter errors. Would you like to restart and repair?" This time, I tried to open an attachment, PDF file (one page), from my customer using Outlook. I've used Win98, Win2000, ME, Vista, XP, Windows 7. I've never had that kind of problem with OS.