This came to me in an email from mssupport.microsoft.com
Whether you mean just the Microsoft Update website cannot work but Windows
updates website works perfects?
If it is the situation, it is a specific issue which may relate to many
factors.
1. Incorrect IE setting or corrupted internet temporary files.
2. Microsoft update related agent files were corrupted.
3. Corrupted system files.
At this time, I suggest we perform following steps to troubleshot the issue.
Step 1: Reset Internet Explorer (IE)
====================
For Internet Explorer 6.0:
1. Click Start, Run, type: “inetcpl.cpl” (without quotation marks) and press
Enter.
2. Select the General tab, and in the Temporary Internet files window, click
"Delete Cookies", and click OK.
3. In the same tab click Delete Files, check the "Delete all offline
contents" box and click OK.
4. Click the Programs tab, and click "Reset Web Settings".
5. Click the Advanced tab, and click "Restore Defaults".
6. Under the Advanced tab, uncheck "Enable third-party browser extensions"
(requires restart).
7. Click OK.
For Internet Explorer 7.0:
1. Click Start, Run, type: “inetcpl.cpl” (without quotation marks) and press
Enter.
2. Switch to the Advanced tab.
3. Click the "Reset Internet Explorer Settings" button.
4. Click Reset to confirm the operation.
5. Click Close when the resetting process has finished.
6. Uncheck the "Enable third-party browser extensions" option in the
Browsing box.
7. Click Apply, click OK.
Step 2: Install Microsoft updates agent 3.0 manually
=======================================
1. Download the file from the following link:
http://download.windowsupdate.com/v7...gent30-x86.exe
2. Save the file to C:
3. Click Start->Run, type: "C:\WindowsUpdateAgent30-x86.exe /wuforce"
(without quotations) and then press Enter to install the Windows Update
engine.
NOTE: There is a space between "C:\WindowsUpdateAgent30-x86.exe" and
"/wuforce"
4. Restart the computer and go Microsoft updates website to check the result
If it not works, let us continue to perform the next step 3.
Step 3: Register some system files and Reload the Update temporary files by
a batch command script
================================================== ======================
1. Click Start, Run, type: notepad C:\fix.bat and press Enter. Choose Yes
when you are prompted.
2. Copy the following commands and then paste them into the opened Notepad
window.
regsvr32 /s %systemroot%\system32\wuapi.dll
regsvr32 /s %systemroot%\system32\wuaueng.dll
regsvr32 /s %systemroot%\system32\wuaueng1.dll
regsvr32 /s %systemroot%\system32\wucltui.dll
regsvr32 /s %systemroot%\system32\wups.dll
regsvr32 /s %systemroot%\system32\wups2.dll
regsvr32 /s %systemroot%\system32\wuweb.dll
regsvr32 /s %systemroot%\system32\softpub.dll
net stop wuauserv
net stop cryptsvc
ren %windir%\SoftwareDistribution oldSD3
ren %windir%\system32\catroot2 catroot3.old
net start wuauserv
net start cryptsvc
3. After you paste the above commands, please close the Notepad window.
Choose Yes when you are prompted to save the file.
4. Click Start, Run, type: C:\fix.bat and press Enter to run the commands we
have pasted.
Please go to Microsoft updates website again to check if the issue can be
resolved.