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I am upgrading my Windows 7 setup (dual partition, one hdd), and I got this

Windows could not update registry data, cancelling install

And the setup is aborted, leaving an undeletable $UPGRADE.~OS and a windows.bt folder

What can be the problem?

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Have you tried running a registry cleaning utility like cccleaner? – Caleb Jares Oct 30 '12 at 0:54
1  
Run a chkdsk /r on the hard drive. – Moab Oct 30 '12 at 2:34
    
I did mydefrag, scandisk, ccleaner and the full surface scan utility from western digital – Magnetic_dud Oct 30 '12 at 11:07
up vote 2 down vote accepted

This is sometimes the result of 3 things:

  1. Windows rot (often updates will screw things up)
  2. Registry cleaners
  3. Bugs with MS software (You may have found a bug with the Windows 8 installer)

I would strongly advise you to do a clean install.

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I opted to wipe the drive and do a clean install – Magnetic_dud Nov 1 '12 at 11:32

Have you ever messed with any registry key permissions? I recommend you back up your personal data, use the Upgrade Assistant to create USB/DVD (ISO) media, then boot from that and clean install Windows 8.

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