First, configure the system to clean boot:
How to troubleshoot a problem by performing a clean boot in Windows
Vista or in Windows 7
IF a 3rd party firewall was being used, ensure the native Vista firewall
is now Enabled by opening the Windows Firewall applet in Control Panel.
Next, download and *save* the System Update Readiness Tool (CheckSUR)
for Vista 32 bit (x86) from the link on this page:
Once the download completes close *all* open browsers and programs that
you had previously opened.
Now run Windows6.0-KB947821-v7-x86.msu.
Restart once CheckSUR has finished it's operation.
See if the system can update now.
If not, then please post the contents of one of the logs that CheckSUR
Windows\Logs\CBS\CheckSUR.log or the CheckSUR.persist.log
"Security updates should *never* have *non-security content* prechecked
> I am running Microsoft Vista 32bit sp1. I had to replace hard drive due to
> problems when computer was made. Hard drive was sent directly to me from dell
> with all the operating systems programs and files that were on the computer
> when it was bought. Since then I have not been able to update Vista,
> Microsoft Office or any other program that came on the pc. I tried to reload
> Vista with the OS disc and the pc is showing that it is a blank dvd, but its
> the same disc that came with the pc from dell. The pc also randomly goes to a
> blue screen and says its "collecting data for memory crash dump" or something
> like that. I can't get my virus scan to update or register. Everytime I try
> to update windows I get a error code: 80070490
> Can someone please help me with this?