Windows does not start after the system drive is compressed

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We have seen how we can compress files, folders or even drives to save space. For many, it is tempting to compress the system drive or C drive to save more space. But that can cause problems!

Compressed system disk – Windows does not start

Using the compression function on the system disk may compress some of the files needed to boot the Windows operating system. It could simply mean that your Windows computer will not boot! You might even end up with a boot loop!

In this article, I will show you what you can do if your Windows computer does not boot or enters a boot loop after compressing the system drive.

There are some methods we can try. I will list everything you can find, the best method that works for you.

Repair at start-up

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The first method is to repair at start-up.

Unzip files manually

The next method is to manually unzip files from the Windows installation drive. Follow these steps:

    • Insert the Windows installation disc or USB flash drive or system repair disc and turn off the computer.
    • Then restart your computer
    • When prompted, press any key, then follow the instructions.
  • On the Install Windows page or the System Recovery Options page, select your language and other settings, and click Next.
  • Click Repair Computer.
  • Select the Windows installation you want to repair and click Next.
      • Now Click Load Driver.
      • You will receive this screen. Click OK.
      • You now get an Explorer window. Click Computer
      • Right-click the installation drive that would be drive C in most cases. Select Properties.
      • Clear the Compress this drive to save space check box and click Apply/OK.
        • C :, Subfolder and files is selected
        • Now click OK and wait a few minutes to decompress it.
        • After restarting the computer, you can see if it is charging.

This should work. If so – great! Otherwise, you only get one last chance!

Manual reconstruction of the MBR

The last method consists in manually rebuilding the MBR or Master Boot Record. There are many ways to do this. You can follow this video tutorial I created on how to recreate MBR. See this tutorial for more details on how to solve the’Bootmgr is Missing’ problem.

Let’s hope something helps! If none of the steps work, you can post it in our forums. We will be happy to help you.

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