Hello, I trying to install SP1 on Windiws 7 x64(KB976932), but I can't do it, the error code 800F0900 is displays.

Hi, Microsoft Windows Malicious Software Removal Tool (KB890830) after download scan http://www.microsoft.com/en-us/download/details.aspx?id=16 How do I reset Windows Update components? Access KB971058 via Internet Explorer (32-bit) only; Run the Fix It in DEFAULT and then AGGRESSIVE modes [1] http://support.microsoft.com/kb/971058 System Update Readiness Tool, you can resolve these inconsistencies and you will be able to install updates from windows updatehttp://support.microsoft.com/kb/947821/en-us#top Thanks & Best Regards,Mohammed Imtiyaz Ali

Try downloading the Service Pack 1 from the following address http://www.microsoft.com/en-us/download/details.aspx?id=5842 and installing it manually (run the installation program as Administrator). Then execute Windows Update again: in case of error, download and run the System Update Readiness Tool from the following address http://windows.microsoft.com/en-us/windows7/What-is-the-System-Update-Readiness-Tool If the problem persists, reset the Windows Update components: read the Microsoft Knowledge Base article 971058. Bye.Luigi Bruno - Microsoft Community Contributor 2011 Award

Hi, Adding to Mohammed and Luigi, I suggest to use System File Checker tool to scan your system and see how it works. Reference: How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7 Hope this helps. Jeremy Wu TechNet Community Support

Hi, Adding to Mohammed and Luigi, I suggest to use System File Checker tool to scan your system and see how it works. Reference: How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7 Hope this helps. Jeremy Wu TechNet Community Support