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15 Aug 2012  

Microsoft Windows 8.1 Pro 64-bit

Hello LCP, and welcome to Sevenforums

While defender may be suffering through the same problem windows update is, they are not linked. Whenever you install a legitimate antivirus program, such as McAfee, Defender should be turned off and disabled, as it is only spyware protection and nothing more. However, as I've seen numerous times, McAfee seems to cause too many problems to work around. Therefore, I recommend uninstalling it. If you would like a lightweight antivirus that is excellent at protection, try out Microsoft's Security Essentials: Spyware Protection | Free Spyware Protection | Microsoft Security Essentials

Now, to work out your problems. Even if you choose to stick with McAfee, please disable it, for now.

Download the file from Option 2 in Brink's tutorial here, save it to the desktop: Windows Update - Reset - then run it. You should see a command prompt open and stream a long list of text

Follow Brink's SFC tutorial: SFC /SCANNOW Command - System File Checker

Restart and let me know if anything is different. Additionally, you may want to do a full scan with MSE (if you installed it) to check for any malware that may be part of the problem
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