home premium to ultimate?

[nrowe46]

Trying to update Vista Home Premium to Ultimate but install stops because necessary files are missing. How do I get around this?

[ua549]

Is Home Premium activated?
Are you installing Ultimate from a genuine Microsoft DVD?

[nrowe46]

As I said I'm upgrading.

[ua549]

Upgrading and/or updating can mean many things.
You have not provided enough information to do problem analysis.

Is the existing OS activated?
Are you installing from a genuine Microsoft DVD? an iso image? files copied to another volume?
All versions of Vista are on the distribution DVD.
The product key determines what features get installed.

[nrowe46]

Yes Vista was on Compaq laptop when bought. Have iso file from download. Was not given an install DVD when bought but had to make one from backup program.

[ua549]

There may be issues with the iso image.

Did you make a DVD from the iso?
Are the files that error actually on the installation media?

[nrowe46]

Yes I did make a DVD and yes all files that I know about are on the disk.

[ua549]

My only suggestion is that OEM versions of of the OS may not contain everything that a retail version does.
Where did the upgrade come from? Is it just a product key?
Upgrading in place from 32 bit to 64 bit is not possible. It requires a clean install.

Sorry I can't be more help. I've never seen this problem before.
I suggest you open an installation support case with Microsoft.