"WindowsUpdate_80070017" "WindowsUpdate_dt000"

http://support.microsoft.com/kb/956704Thanks Uday Kiran, Senior Consultant Cyquent Technology Consultants, Dubai Please Mark as answer if it helps you

Hello, also try this: Disable all security softwares Reset Windows Update Components Run chkdsk /r /f and sfc /scannow Download and install System Update Readiness tool for Windows 7 If this does not help then perform a repair install of your OS or try what is mentioned in this Microsoft article: http://support.microsoft.com/kb/822798 This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner 2010 / 2011 Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows 7, Configuring Microsoft Certified IT Professional: Enterprise Administrator