You have tried the Startup Repair disk; to no avail.
You can try asking your question in the Windows Update Forum:
This is the Vista Install, Upgrade and Activate Forum.
You will get the best help for any Update/Service Pack problem in the Vista Update Forum; link below:
http://social.answers.microsoft.com/Forums/en-US/vistawu/threads
When you repost there, kindly include any Error Codes, and exactly what happens when you attempt to Update.
That way you will receive the best help there.
To reinstall:
Borrow a proper Microsoft Vista DVD(not Dell, HP, etc).
A proper Vista DVD contains all Vista versions.
The Product Key determines which Vista version gets installed.
There are 2 Vista disks: one for 32bit Operating System, and one for 64bit Operating System.
If a clean install is required with a proper Vista DVD (not HP, Dell Recovery Disks):
Go into your Bios/Setup, or Boot Menu, at startup, and change the Boot Order to make the DVD/CD drive 1st in the Boot Order, then reboot with the
disk in the Drive.
At startup/power on you should see at the bottom of the screen either F2 or DELETE, to go into Bios/Setup, or F12 for the Boot Menu
[http://support.microsoft.com/default.aspx/kb/918884](http://support.microsoft.com/default.aspx/kb/918884)
MS advice on doing clean install.
[http://www.theeldergeekvista.com/vista\_clean\_installation.htm](http://www.theeldergeekvista.com/vista_clean_installation.htm)
A Tutorial on doing a clean install
[http://www.winsupersite.com/showcase/winvista_install_03.asp](http://www.winsupersite.com/showcase/winvista_install_03.asp)
Windows Vista Installation Super Guide
Save all Data, as it will be lost during a clean install.
Cheers.
* * *
Mick Murphy - Microsoft Partner