Cannot Update Windows using Windows Update

Run CCleaner to clear up PC Junk. Also flush the Software Distribution Folder. Reboot. If you are using WindowsUpdate try using MicrosoftUpdates and vice versa.

If you still cannot Update Windows Vista using WindowsUpdate, try this :

Open Internet Explorer > Tools >Internet Options > Security > Click 'trusted sites' icon >Click Sites > uncheck 'require server verification'.

Then add following sites :

http://*.windowsupdate.microsoft.com http://*.windowsupdate.com http://update.microsoft.com  http://update.microsoft.com/microsoftupdate/v6/default.aspx

Click Close > Apply > OK. This is known to help the GenuineValidated Windows, in some cases, but not always.

 

Do also ensure that you have the latest Windows Update Agent installed.

Try to re-register the following dll's individually. See How to Register / Unregister dll's if you are not sure how to do it.

wuapi.dll wuaueng.dll wups.dll wups2.dll wuwebv.dll wucltux.dll wudriver.dll

Alternatively, open Notepad. Copy-Paste the following command lines into it and save the file using a .bat or .cmd extension.

regsvr32 /s wuapi.dll regsvr32 /s wuaueng.dll regsvr32 /s wups.dll regsvr32 /s wups2.dll regsvr32 /s wuwebv.dll regsvr32 /s wucltux.dll regsvr32 /s wudriver.dll

Double-click the icon of the .bat or .cmd file; command window will open. Run the commands, and then close. Reboot, and see if Windows Updates is working OK.

Also Open IE > Tools > Internet Options > Advanced > Security Settings > Ensure that the two boxes "Enable SSL 2" or "Enable SSL 3" are checked.

 

For more Info click on the link below

http://www.winvistaclub.com/t4.html