Hello,

That could be a Windows validation error.

Go to this Microsoft page and 'Validate' your copy of Windows. Then try the update again.

My Windows has been validated.  Error message still pops-up.

Hello again,

Microsoft offers free support for service pack issues, and critical updates.  :emotion-21:

:emotion-55:   Give them a phone call, and try not to mention that you own a Dell, or they may push you back to Dell support.

A belated "welcome " to the forums :emotion-21:

You're not alone in having problems installing Vista SP1 through Windows Update :emotion-6:

I'd suggest you download (what I'll call - for want of a better word) the 'stand-alone' version instead :emotion-55:

It's a 435MB file though, so I hope you've got a broadband connection?

The stand-alone version finally worked!

:emotion-21:

You should mark the thread as 'Solved' now then:emotion-5: