Windows 7 ultimate service pack 1 (64 bit) standalone update installation stuck

I've downloaded the standalone installation package for Windows 7 ultimate service pack 1 (64 bit) but its stuck at approx. 55% for nearly an hour and a half. It hasn't yet restarted or prompted me to restart my computer and when I did it didn't shut down and I had to power off my laptop by long pressing the power button. What should I do??

Question Info

Last updated May 30, 2019 Views 6,216 Applies to:

​Hi Keshav,

Thank you for posting your query in Microsoft Community forums.


From the issue description, I see that you are unable to install Windows 7 SP1 and installation is stuck at 55%.

I can imagine the inconvenience you have experienced. We are here to help and guide you in the right direction.


To resolve this issue I may need few more information:
1. Do you get any error code?
2. Did you tried installing Windows 7 SP1 through Windows Update?
3. Do you face any issue while installing other updates?

Method 1:
I would suggest you to reset Windows Update Components and check if you can install Windows 7 SP1.

Important: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:


Method 2:
If the issue persists, I would suggest you to set the computer in clean boot and then try to install Windows 7 SP1.

By setting your system in clean boot state helps in identifying if any third party applications or startup items are causing the issue.

How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7:

Note: After clean boot troubleshooting step, follow Step 7 in the provided link to return your computer to Normal startup mode.

Refer to the link for additional information.

Learn how to install Windows 7 Service Pack 1 (SP1)
Let us know the status of the issue after performing the troubleshooting steps. If you need any further assistance or information about Windows, I will be glad to help you. We, at Microsoft strive towards excellence.

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