You do not have the option of downloading Windows 7 SP1 when you use Windows Update to check for updates

Method 1: Confirm that Windows 7 SP1 is not already installed and that you are not running a prerelease version of Windows 7 SP1

To do this, follow these steps:

1. Click Start , right-click Computer, and then click Properties.

2. Check the Windows edition section:

   1. If Service Pack 1 is listed, Windows 7 SP1 is already installed on your computer.

   2. If a version number (for example, v.153 or v.720) is listed after Service Pack 1, a prerelease version of Windows 7 SP1 is still installed on your computer. You have to uninstall it before Windows Update will offer you the release version of SP1. For more information, see
      
      How to uninstall Windows 7 SP1.

Method 2: Check for pending updates

Update 2454826, 2534366, and 2533552 may have to be installed on your computer before Windows 7 SP1 will be offered in Windows Update.

To install these updates by using Windows Update, follow these steps:

1. Click Start , click All Programs, and then click Windows Update.

2. In the navigation pane, click Check for updates, and then wait while Windows looks for the latest updates for your computer.

3. If any important updates appear, click Install updates.

    If you are prompted for an administrator password or for confirmation, type the password or provide confirmation.

4. Restart the computer if you are prompted to do this when the installation is complete.

5. Check Windows Update again to see whether Windows 7 SP1 is now available.

Update 2454826, 2534366, and 2533552 are also available for download from the Microsoft Download Center. For more information about these update and about how to install these updates, click the following article number to view the articles in the Microsoft Knowledge Base:

2534366Windows 7 Sp1 installation fails on a machine with all Language packs installed Error 0xC0000009A

2533552 An update that prevents a "0xC0000034" error message when you try to install Windows 7 SP1 or Windows Server 2008 R2 SP1 is available
2454826 A performance and functionality update is available for Windows 7 and for Windows Server 2008 R2

Method 3: Verify that an incompatible version of SafeCentral is not installed on your computer

Windows SP1 may not appear in Windows Update if certain versions of SafeCentral are installed on your computer. SafeCentral is a security program that is manufactured by SafeCentral, Inc.

If your computer is running SafeCentral version 2.9.0.0 or an earlier version, you have to update SafeCentral before you can install Windows 7SP1.

To determine whether SafeCentral is installed, follow these steps:

1. Click Start , click Control Panel, click Programs, and then click Programs and Features.

2. Search the list of programs for SafeCentral. If SafeCentral version 2.9.0.0 or an earlier version is installed, visit the
   SafeCentral website for more information.

Method 4: Check whether you have Intel integrated graphics driver Igdkmd32.sys or Igdkmd64.sys and whether you upgraded the driver

Windows 7 SP1 will not appear in Windows Update if you have one of the following files on your computer.

• Igdkmd32.sys (32-bit), versions 8.15.10.2104 through 8.15.10.2141

• Igdkmd64.sys (64-bit), versions 8.15.10.2104 through 8.15.10.2141

These drivers are known to cause problems with certain applications that use D2D (Direct2D). For example, if you use these drivers together with Windows Live Mail under certain circumstances, Windows Live Mail could crash.

To check for the Intel integrated graphics driver and driver version, follow these steps:

1. Start DirectX Diagnostic Tool. To do this, click Start , type dxdiag in the Search programs and files box, and then press Enter.

2. Click the Display tab.

3. Note the driver and driver version.

4. If you have the Intel integrated graphics driver and driver version 8.15.10.2104 through 8.15.10.2141, visit the computer manufacturer's website to see whether a newer driver is available.

Update 2454826 is also available for download from the Microsoft Download Center. This update may help with performance and functionality improvements for this issue. For more information about this update and about how to install this update, click the following article number to view the article in the Microsoft Knowledge Base:

2454826 A performance and functionality update is available for Windows 7 and for Windows Server 2008 R2

Method 5: Make sure that you did not use vLite to customize your Windows 7 installation

vLite is a third-party program that is used to customize an installation of Windows 7. vLite is known to remove some Windows system components. If you know for a fact that you used vLite to customize your installation of Windows 7, you should not expect Windows Update to offer you the option to install Windows 7 SP1.

For more information about issues that are known to occur when you use vLite and try to install Windows 7 SP1, see the
Why am I receiving an error message that system components are missing when installing Windows 7 SP1 topic.

For more information about how to obtain the stand-alone version of Windows 7 SP1, see Learn how to install Windows 7 Service Pack 1 (SP1).

Method 6: Download the Windows 7 SP1 from Microsoft Download Center

If you tried all the above methods and still cannot find Windows 7 SP1 available in Windows Update, download the Windows 7 SP1 from Microsoft Download Center:

Windows 7 and Windows Server 2008 R2 Service Pack 1 (KB976932)