Windows 8 upgrade to windows 8.1 RTM fails with error code 0x101 – 0x2000C

installationupgradewindows 8windows 8.1

I have a MSDN Subscription and downloaded Windows 8.1 RTM today.

It fails to install.

After mounting the ISO and installing (with a Windows 8.1 Pro product code), selecting "Keep my apps and settings", it copies all installation files, restarts and then bluescreens at around 50%, then rolls back to the previous version.

System has 64 GB Memory, Supermicro, Xeon E5-1650, Intel SSD, runs Hyper-V, Windows 8 Pro.

What may be causing this and how do I fix it?

Best Answer

Disable Windows Firewall and then try to install Windows 8.1.  Details are here: Windows Firewall from start to finish.

OR

Boot the computer in Clean Boot and try to install Windows 8.1: http://support.microsoft.com/kb/929135

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