There is a lot of info about this on Google,
Rename the SoftwareDistribution folder by following this procedure......
First, stop the Automatic Updates Service
Go to Start>Run and key in:
Click on OK or hit ENTER
In the right-hand pane of the Services window, right-click on Automatic
Updates and then select Stop
Now, navigate to C:\Windows (C:\WINNT, if using Windows 2000) folder, locate
and rename the SoftwareDistribution folder to SDOLD
Restart the Automatic Updates Service by re-opening the Services window,
right-click on Automatic Updates and then select Start.
Please note that a "side effect" of renaming (or deleting) the
SoftwareDistribution folder is that you will lose your current Update
Taken from : click here
Hope this helps