Possible reasons :-
1. Internet Explorer temporary files corrupted.
2. Background Intelligent and Event Log service not started
3. SoftwareDistribution folder has become corrupted
4. You may need to re-registered some dlls files
5. You may need to add Windows Update to the Trusted Sites Zone:
6. Spyware.
7. Third party programs running in background.
8. ActiveX controls corrupted
9. Antivirus
Suggestion 1:-
Clearing Temporary Internet files, cookies and history in Internet ExplorerTools>Internet Options>General
You'll see Delete Cookies, Delete files, Delete History
NB: "Delete all offline content", will delete all files needed to browse the websites offline.
Reboot and try Windows Update again.
Suggestion 2:-
1: Check that the Background Intelligent Transfer Service to is set to Automatic and verify the Status is Started.
Click Start, Choose Run, and in the Run box, type services.msc, Click OK
Locate the Background Intelligent Transfer Service service, and right-click to select it.
Select Properties, and in the Startup Type list, select Automatic. Verify the service Status is Started. Click OK.
2. Check that the Set Event Log service is set to Automatic and verify that the Status is Started
Click Start, Choose Run, and in the Run box, type services.msc, Click OK.
Locate the Event Log service, and right-click to select it.
Select Properties., and in the Startup type list, select Automatic. Verify the Service status is Started. Click OK.
3. Register qmgr.dll and qmgrprxy.dll
Click Start, Choose Run and in the Run box, type regsvr32 qmgr.dll, Click OK.
Click Start, Choose Run and in the Run box, type regsvr32 qmgrprxy.dll, Click OK.
Suggestion 3:-
It is possible that the contents of the SoftwareDistribution folder have become corrupted, so try renaming the SoftwareDistribution folder. Click Start, Choose Run.
In the Run box, type services.msc.
Click OK.
Right-click the Automatic Updates service. Click Stop.
Stopping the service will take a moment.
Rename the "SoftwareDistribution" folder:
a. Click Start, click Run, type: %systemroot%
Click OK.
b. Right-click the SoftwareDistribution folder, and then click Rename.
c. Type SoftwareDistribution.old, and then press ENTER to rename this folder.
Click Start. Choose Run.
In the Run box, type services.msc.
Click OK.
Right-click the Automatic Updates service. Click Start.
Starting the service will take a moment.
Please note that your update history is contained in the "datastore" folder and when you rename the Software Distribution folder, the history is lost but it's not important. You can if need be, copy the contents back from the renamed softwareDistribution.old folder. Losing the history of Windows
Updates is not important.
Suggestion 4:-
Certain files may have become unregistered, and you will need to register them again:-
Click Start, Choose Run and in the Run box type CMD and press enter.
paste below commands.
net stop wuauserv
regsvr32 wuapi.dll
regsvr32 wups.dll
regsvr32 wuaueng.dll
regsvr32 wuaueng1.dll
regsvr32 wucltui.dll
regsvr32 wuweb.dll
regsvr32 MSXML3.dll
regsvr32 qmgr.dll
regsvr32 qmgrprxy.dll
regsvr32 jscript.dll
regsvr32 wups.dll
regsvr32 wuaueng.dll
regsvr32 wuaueng1.dll
regsvr32 wucltui.dll
regsvr32 wuweb.dll
regsvr32 MSXML3.dll
regsvr32 qmgr.dll
regsvr32 qmgrprxy.dll
regsvr32 jscript.dll
net start wuauserv
Suggestion 5:-
Add Windows Update to the Trusted Sites Zone: Please note that Security settings in Internet Explorer must be set to Medium or lower for ActiveX files to correctly pass to your computer.
Only the Web sites listed in Internet Explorer's Trusted Sites Zone will be affected by the lowering of Security settings. Your current security settings for all other Web sites will remain as they are currently
configured.
Open Internet Explorer, click Tools, and then click Internet Options, Click Security. Click Trusted Sites Zone. Click Sites. Clear the Require server verification (https:) for all sites in this zone check box.
Use the Add button next to the Add this Web site to the zone box to add the following sites:
http://*.update.microsoft.com
https://*.update.microsoft.com
http://download.windowsupdate.com
Suggestion 6:-
The below links assist you in checking your system for parasites: http://aumha.org/a/noads.htm
Please note that some malware may kill the internet connection when it is removed, the program on the link below will enable you to regain the internet connection.
Spyware Programs links:-
(Windows Defender)www.lavasoftusa.com Ad-Aware
http://www.security.kolla.de Spybot
Malware Removal
THE PARASITE FIGHT - Finding, Removing & Protecting Yourself From Scumware
Richard Harper's Guide to Cleaning Pests
Suggestion 7:-
Make sure you haven't got anything blocking Windows Update like Nortons, Zonealarm etc
Also make sure you don't have a Web Accelerator working in the background such as NetZerio, HiSpeed, Speedband etc.
Suggestion 8:
If you need to reinstall the ActiveX controls (because they may have become corrupt):-
Follow this article -
The Windows Update Web site and the Microsoft Update Web site do not scan for updates when you repair a failed installation of Windows XP Service Pack 2 or of Windows XP Service Pack 1
http://support.microsoft.com/kb/916259
Suggestion 9:
Stop Antivirus services and retry.
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