Windows 7 Service Pack 1 Error: C000009A

I talked about solutions to Windows 7 Service Pack 1 installation error0x800F0A12. Here’s another problem when you have installed SP1, you may get a Blue Screen Of Death (BSOD) with the following error message:

Error C000009A applying update operation {###} of {###} (\Registry…)

This error is the result of any unused language packs installed in Windows 7. You will need to uninstall the unused language packs, uninstall SP1 and then try installing Windows 7 Service Pack 1 again to make sure that SP1 is properly installed. Instead of uninstalling the SP1, you can restore your computer to an earlier date when SP1 was not installed. Then you can uninstall any language packs that are unused on your computer. Here’s how you can uninstall the language packs:

To uninstall language packs, follow the instructions below:

  1. Click the Start button, and then click Control Panel.
  2. In the search box, type display languages, and then, under Region and Language, click Install or uninstall display languages. Administrator permission required If you’re prompted for an administrator password or confirmation, type the password or provide confirmation.
  3. In the Install or uninstall display languages dialog box, click Uninstall display languages.
  4. Select all unused language packs, and then click Next.

Now you can install Windows 7 Service Pack 1 again to make sure that you don’t get any BSOD or other errors. You can always install the language packs again once the service pack has been installed successfully.

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