First there is some information for XP here:
http://technet.microsoft.com/en-us/library/bb457078.aspx
From that:
In order to reduce a significant source of piracy, Microsoft has
disabled online activation for COA Keys that are attached to PCs that
have been pre-activated by OEMs.
If that also applies to Vista (and i think it is), then the OEM Sticker
on your PC has invalid key (so no chance to install it with that).
Another thing why it will not work because the recovery disc differs
from your oem disc because it contains HP's OEM Certificate and HP's SLP
Product Key (for your version of Vista).
You can verify that by checking it you will see that currently installed
Vista's Product Key it will differ from the one sticked on the PC
because recovery image most likely use SLP key.
There is chance it would install with the SLP key if your Ultimate is
OEM but would surely would fail Activation because the OEM media most
likely missing OEM Certificate.
Despite of all above:
I found an MS presentation about it here:
http://download.microsoft.com/downl...sing_WindowsVista_DesktopOptimizationPack.ppt
Most slides is in foreign language for me, but the 31th one has some
intresting information about OEM Activation Options :
Option 3: Customer creates & installs customized image
Customer obtains OEM’s certificate from OEM, and SLP product key from
Microsoft.
Customer creates Master image, including SLP product key, OEM
certificate(s) etc
OEM creates new systems using generic Windows image matching COA sticker
attached to system.
Customer wipes and reloads base OEM systems with customer Master image,
which also serves as recovery media.
So looks like there is still an official option, but never met an OEM
who would offered this.
Csaba