how good is your internet download speed/connection? and do you have a lot of processes running in the backround? check your Task Manager [Processes] tab and kill any progs that you are not Actually Using at the moment
if you stopped or restarted your pc in the middle of the updates the download file may be damaged.
Still no joy, then try: Renaming the SoftwareDistribution folder:
In the Run box, type "services.msc" (without the quotes)
Right click the Automatic Updates service
Stopping the service will take a moment.
Rename the "SoftwareDistribution" folder:
a. Click Start, click Run, type "%systemroot%" (without the quotes") and then click OK.
b. Right click the SoftwareDistribution folder, and then click Rename
c. Type: SoftwareDistribution.old and then press ENTER to rename this folder.
In the Run box, type "services.msc" without the quotes
Right -click the Automatic Updates service
Starting the service will take a moment.
There's no automatic update option in services.msc but I tried stopping Windows Update in services.msc and renaming the softwaredistribution but its giving me error