Windows 8 and 8.1 Forums


Windows 8 upgrade error

  1. #1


    Posts : 6
    Windows 7

    Windows 8 upgrade error


    I have Windows 7 ultimate PC. I have bought Windows 8 Pro DVD & when I try to upgrade to Windows 8 an error comes up: Error - 0x8007045a
    This comes up even before the first restart within 5 minutes of starting the installation.
    I have done all this:
    Removed all incompatible softwares
    Removed all antivirus
    Ran Windows update
    Ran checksur
    Tried doing clean boot & then start installation
    Tried starting in safe mode & then start installation
    Ran sfc /scannow--no problem

    This all did not helped me. Still I am facing the same issue.
    I found this article to be my problem after searching for the problem, but I do not understand how to install this parser thing:
    Error - 0x8007045a while installing Windows 8 - Microsoft Community

    & PLZ do not suggest me to do clean install, it would be such a pain to set up all my 167 programs again.
    Last edited by myzoneajay; 16 Nov 2012 at 18:47.

      My System SpecsSystem Spec

  2. #2


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    I have Windows 8 ultimate PC. I have bought Windows 8 Pro DVD & when I try to upgrade to Windows 8
    Why are you trying to downgrade?

    Windows 8 ultimate, would be Windows 8 Pro plus the Pro pack.
      My System SpecsSystem Spec

  3. #3


    Posts : 6
    Windows 7


    Quote Originally Posted by theog View Post
    I have Windows 8 ultimate PC. I have bought Windows 8 Pro DVD & when I try to upgrade to Windows 8
    Why are you trying to downgrade?

    Windows 8 ultimate, would be Windows 8 Pro plus the Pro pack.
    Sorry my mistake, I am on Windows 7 Ultimate. I am so messed up on solving this issue.
      My System SpecsSystem Spec

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