Uninstall Windows 7 Service Pack 1 (SP1) [How To]
Windows 7 Service Pack 1 (SP1) is an important update that includes previously released security, performance, and stability updates for Windows 7. Installing SP1 helps keep Windows 7 up to date, but if you encounter a problem with hardware or a program after installing the service pack, you might want to temporarily uninstall it to troubleshoot the problem.
In this article, we will show you how to uninstall Windows 7 Service Pack 1 (SP1). The process is simple and you can do it by using the Programs and Features or using the Command Prompt.
Uninstall SP1 using Programs and Features
Click the Start button, next click Control Panel, click Programs, and then click Programs and Features.
Click View installed updates link present in the left hand side.
Click “Service Pack for Microsoft Windows (KB 976932),” and then click Uninstall.
It’ll ask for confirmation, click on “Yes” button.
Note: If you don’t see Service Pack for Microsoft Windows (KB 976932) in the list of installed updates, your computer likely came with SP1 already installed, and you can’t uninstall the service pack. If the service pack is listed but grayed out, you can’t uninstall the service pack.
Uninstalling SP1 using the Command Prompt
Click the Start button, and then, in the search box, type Command Prompt or
cmd. In the list of results, right-click Command Prompt, and then click Run as administrator. If you’re prompted for an administrator password or confirmation, type the password or provide confirmation.
Type the following:
wusa.exe /uninstall /kb:976932
Press the Enter key.
Note: If you’ve used Disk Cleanup since installing SP1, the backup files needed to uninstall the service pack might have been deleted from your computer. To remove the service pack, you’ll need to reinstall Windows 7. If you installed SP1 yourself, you can uninstall it. However, if your computer came with SP1 already installed, it can’t be uninstalled. [source]
But, If you still is brave enough and want to delete the backup files read here.