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I have a new Dell desktop XPS 8700 i5 ; 12GB Ram ; 4 cpus @ 3 GHz ; 1 TB HHD

The download and checking went error free. It asked to restart to do the install then after 26 Percent of the install it Errored out with Error Code 0xC1900101 - 0x2000C... Then reverted back to Windows 8 ? Any guesses...

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  • I think you're having effectively the same problem as this fellow, and me: superuser.com/questions/661311/… But it's not quite the same. I never even got a percentage. Oct 18, 2013 at 22:00
  • did you update to Windows 8.1 before you upgraded to 8.1 Pro?
    – Ben Plont
    Oct 18, 2013 at 22:33
  • @BenPlont the author already had Windows 8 Professional
    – Ramhound
    Oct 18, 2013 at 22:46
  • Did This happen more than once? Be sure you have installed all updates before you attempt again
    – Ramhound
    Oct 18, 2013 at 22:48
  • @Ramhound are you sure? OP says the move is from Windows 8 to Windows 8.1 Pro. I don't see anywhere in the post that says the starting OS was the Pro edition.
    – Ben Plont
    Oct 18, 2013 at 23:03

2 Answers 2

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  1. Disconnect all the devices connected to your computer. (HDD, keyboard, printer, second monitor)

  2. Remove directory "$windows.~bt" in C:/

  3. Windows key + R press

  4. Enter wsreset.exe and hit Enter

  5. Restart your computer.

  6. You try to update again.

The command resets the Windows Store cache without removing installed apps or account settings.

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  • It would be helpful if you can tell us in simple language what this actually command does lest it does something undesirable.
    – Mohit
    Oct 24, 2013 at 6:21
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Try this:

http://support.microsoft.com/kb/949358

It is one of the fixes for 8.1 Update problems.

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