Cannot repair/upgrade Ultimate SP2

Hi

I am trying to do a "repair install" of Vista Ultimate, updated to SP2, I have slipstreamed a Vista Install disk to SP2 but when I run the install I get no upgrade option and a message that says I need a later version install disk.

I cannot uninstall SP2 as the uninstall fails.

Is there anything else I can do?

thanks

Daniel

Doesn't matter, I have reinstalled the OS.

Cheers

Daniel