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I got a notification a few hours ago that windows 8.1 had installed an auto update that required a restart. I decided to delay the restart. Then, as I was doing a video chat session in Lync the Lync app crashed. A few seconds later my PC restarted. Now I cannot boot into windows 8.1. When I try the machine simply reboots at some point during bootup. My machine is configured to dual boot and I'm successfully using Windows 7.

So I believe a recent update has destroyed my system. Anyone hear of a recent update causing PC crashing or have another suggestion? I can still access the windows 8 HD which is a separate physical drive.

Edit
After nothing particularly different my system decided it was ok to boot into Windows 8.1. The following updates were installed today:

KB2868626
KB2900986
KB2898108
KB2888505
KB2876331
KB2862152

Evntvwr log shows Event ID 6008: "The previous system shutdown at 10:42:57 AM on ‎11/‎20/‎2013 was unexpected."

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do you have a system restore point which you can use to restore Windows to a point before the update was installed? –  magicandre1981 Nov 20 '13 at 17:15
    
After 2 failed boots you should be given a chance to boot into Safe Mode. Are you able to access Safe Mode? Which Boot Manager are you using, if properly configured, the Windows 8 Boot Manager should be selecting Windows 7. –  Ramhound Nov 20 '13 at 17:27
    
I have not been given any safe mode options after many more than 2 failed boots. I think i need to be able to acess safe mode to restore. I will try F12? To force boot menu access. Restarts are happening before the login menu –  P.Brian.Mackey Nov 20 '13 at 17:52
    
If your unable to boot into safe mode you cannot rule out possible conflicts with the update. What updates were installed? –  Ramhound Nov 20 '13 at 18:10
    
@Ramhound I don't know what it installed. This was done by auto update. I don't know of any way to check because I can't get into the OS. –  P.Brian.Mackey Nov 20 '13 at 18:40
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