The System Update Readiness Tool can help fix problems that might prevent Windows updates and service packs from installing. For example, an update might not install if a damaged system file prevents the update from recognizing the version of Windows that's running on your computer.
If your computer is having problems installing an update or a service pack, download and install the tool, which runs automatically. Then, try installing the update or service pack again.
Click the link in the table that corresponds to the version of Windows running on your computer.
Windows Vista 32-bit (x86)
Windows Vista 64-bit (x64)
Windows 7 32-bit (x86)
Windows 7 64-bit (x64)
Windows Server 2008 32-bit (x86)
Windows Server 2008 64-bit (x64)
Windows Server 2008 Itanium-based
Windows Server 2008 R2 64-bit (x64)
Windows Server 2008 R2 Itanium-based
On the Microsoft Download Center webpage, click Download.
If you see a message indicating that validation is required, click Continue and follow the instructions on your screen. Then, click Download.
Do one of the following:
To install the program immediately, click Open or Run, and then follow the instructions on your screen.
To install the program later, click Save, and then download the installation file to your computer. When you're ready to install the tool, double-click the file.
In the Windows Update Standalone Installer dialog box, click Yes or OK.
In the Installation complete dialog box, click Close.
Try installing the update or service pack you were trying to install previously.
The tool can take several minutes to install. Even if the progress bar appears to stop, don't cancel the installation.