I'm running Win 7 ultimate 64bit and I was using BitDefender 2017 (free version) and it was woking fine until a few days ago. I got a an Action Center notification that my antivirus was turned off, so I tried turning it on from there, but nothing happened, so I clicked on the icon to open Bitdefender and the little "thinking" circle appears next to the pointer, then disappears and then nothing. No error message, no open program, just nada. I even checked for the process in task manager, but its not under the processes tab or applications. There is however 2 tasks on the applications tab that just say "client" and "running" but if I right click on either one and select 'go to process' again, nothing happens. So, I got rid of Bitdefender to try a different antivirus, but now none of them will install. I've tried AVG, Vipre, and Avast. Im able to download the installer, but when I click on "run"... NOTHING HAPPENS! I'm also unable to turn on Windows Defender and when I try to open System Restore (I'm starting to feel like a broken record) nothing happens. Can someone Please help?