Last chance saloon time Dodge
I was looking for another Item,for an earlier answer, when something caught my eye
Try this
Open the Control Panel. Locate Administrative Tools
Click on Services ...
Click the Extended View Tab(underneath the Box)
Big List scroll Down Until you see
Security Center click on it
The settings message(to the right for this should read Started and Automatic
If that is not right, look to the information panel (On the Left) and Click the
Restart link OK?
Next scroll down to the Item
"Task Scheduler" Should also Read Started & Automatic I think this is where your No-go issue is located

May be showing Stopped or Disabled? Again Click the
Restart Link TIP If it shows as Started Click the Stop Link then the Restart link .The messages will change!(Try to fool it!)

Last link is to locate
Windows Installer near the bottom of the list
This is Listed as Manual Any other Message is
no good
Only 1 link on this Item and that is
StartOnce you find this List the Job to check the settings and do any alterations will take you about a Minute

Next try the Windows Update site again
Use this Link and Click on the "Express" Button Only Proviso is you must have ActiveX enabled with IE7.0, otherwise you get Nothing.Easy to overlook! 
Any Joy now?
