Hello, I hope this is the right spot to post this. Sorry if it is not. I've got the Windows Updates downloading automatically. Just recently, this one update keeps failing. I get this error code: Code 66A: Windows Update encountered an unknown error. The update I am trying to install sounds like an important one. Security Update for .NET framework 4 on Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows Server 2008 , Windows Server 2008 R2 for x64-based Systems (KB2160841) For whatever reason, it keeps failing. I tried to troubleshoot but had no luck. Does anyone know how to fix this? Also not sure if it is related but: After this update failed about 2 days later (Could be coincidence?) at the bottom right corner it said something like External Driver detected, Intel Matrix Storage Manager". I didn't have any USB or any external drives, which I thought was weird. I google'd it and it seemed to be OK but no idea where that came from. Anyone have any idea? Thank you so much in advance.