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Disable any firewalls or virus protection, and try these suggestions:
http://www.winvistaclub.com/t4.html
See if booting into safe mode by tapping f8 during booting and choosing safe mode with network will allow you to update.
Do you have SP1 installed, or SP2 ?
Try this, go here and switch to microsoft update....
http://update.microsoft.com/microsoftupdate
And be sure it's added to your trusted sites:
Making a Web site a trusted site in your Internet Explorer settings allows that site to run necessary ActiveX controls without changing the security level for your regular Internet browsing. You should only add sites that you know are reputable to this list.
To add Microsoft Update to your list of trusted sites:
1. In Internet Explorer, click Tools, then click Internet Options. (Alternatively, you can click Start, click Run, type inetcpl.cpl, and then click OK.) The Internet Properties dialog box appears.
2. Click the Security tab.
3. In the Select a Web content zone to specify its security settings box, click Trusted sites, and then click Sites.
4. In the Trusted sites dialog box, clear the Require server verification (https:) for all sites in this zone check box.
5. In the Add this Web site to the zone text box, enter http://update.microsoft.com/microsoftupdate, then click Add.
6. Click OK.
7. Click OK again to exit the Internet Options dialog box.
Now try Microsoft Update again to determine whether the problem is resolved. You may have to close all your Internet Explorer browser windows and then re-open Internet Explorer for the change to take effect.
Turn off any ad-removal programs, Web accelerators, anti-spyware, and antivirus programs before you try to access the Microsoft Update site. These programs can cause script errors. Be sure to turn them back on once you've finished your update.
Computer Support Specialist
Certified IT Guru since C-64 and Amiga, expert at grey areas....