My pc has developed a weird issue lately. When I try to open pc settings in Windows 8.1 Pro w/Media Center x64, as soon as it opens, the window disappears. It still shows up in the top left corner of my screen, but it just says PC Settings and shows nothing. My Windows 8.1 x64 laptop doesn't have this issue. Bitdefender Internet Security 2015, SUPERAntiSpyware Pro and Malwarebytes free have found no threats on my pc. Not even with safe mode scans. All my drivers and software are up to date.