Windows 7 Upgrading: "Windows was unable to create a required installation folder"

Question

I have an office machine that's running a full OEM Windows 7 Professional x64, and I've been handed a full retail Windows 7 Ultimate x64 DVD and key to upgrade the machine with. I had assumed that Microsoft would facilitate this process, instead I got the following error when I run setup.exe and clicked "Install Now":

Error: 80070005 - Windows was unable to create a required installation folder

I followed the instructions at: http://support.microsoft.com/kb/968003

This is all being done a BootCamped Mac.

But now I'm wondering if I've made a mistake by doing so.

Can anyone help?

Solution

Apparently Apple is to blame (as usual). You're supposed to have to install the following utility to unmount the Apple partition while you upgrade.

http://support.apple.com/kb/TS3172

Comments

[Django Reinhardt]

@JourneymanGeek It's "just" refusing to upgrade. It's essential that it does upgrade.

[Ramhound]

Are you running a support version of BootCamp and OS X?

[3Dave]

Nice catch - this worked perfectly. I was experiencing the same issue while installing Win8 to a new partition, but this corrected the problem.

[Nathan Moinvaziri]

Worked for me! Required a restart then I could install.