Vista will not update from Service Pack 1 to Service Pack 2

Hi all I decided it was time to install Internet Explorer 9 but I am running Vista SP1 so I thought I'd update to SP2 also.

When I tried to update Vista SP1 to SP2 it has failed many times. I also tried using fixit and various other items but still no joy any help me please??

Updates are set to automatic tried several reboots no joy. When I also look at Windows Updates and click view installed updates nothing is there but there are loads when I View Update History.



This update fails all the time:



Windows Search 4.0 for Windows Vista (KB940157)

Installation date: ‎15/‎10/‎2011 08:53

Installation status: Failed

Error details: Code 80070490

Update type: Recommended

Windows Search 4.0 helps you to find, preview, and use your documents, e-mail, music, photos, and other items. On an upgrade from previous versions, you will need to rebuild your index. After you install this item, you may have to restart your computer.

More information:
http://support.microsoft.com/kb/940157

Help and Support:
http://support.microsoft.com

This one does too:



Intel driver update for Intel(R) PRO/Wireless 3945ABG Network Connection

Installation date: ‎14/‎10/‎2011 09:39

Installation status: Failed

Error details: Code 643

Update type: Optional

This driver was provided by Intel for support of Intel(R) PRO/Wireless 3945ABG Network Connection

More information:
http://winqual.microsoft.com/support/?driverid=3016

Help and Support:
http://support.microsoft.com/select/?rel="nofollow" target=hub



When I try and run Fixit it starts then says Powershell has failed.



Any ideas as to what I can do??