Vista Ultimate Disk w/ Home Premium Key Code?

I have a legal version of Vista Ultimate 64/32 DVD copy (recently built a new system)

Laptop I purchased a few years ago with Vista Home Premium.

I need to reformat the laptop but I don’t have Vista Home Premium disk so I was wondering if I could use the Ultimate disk but use the Home Premium Key code on the back of the laptop? Is it ok?

Thanks

And if it does work for you, Please take the time to post back your results. Thanks

I want to let you guys know that the OEM vs. retail disk is a real problem. I had this problem with a recently purchased Dell Vostro. I did the clean install with a retail version of XP because we had payed for the dowgrade for our business, but we didn't want all the DELL junk on it. I was able to sucessfully do the reinstall, but, when I tried to activate windows afterward, I could not. I called India and some one told me the key was bd (of course they won't explain the details). Then I called Dell and got into a 2 hour long argument with a bunch of representatives who had no idea what they were talking about...thank God, we had purchased a protection plan, so they transferred me to a gold-star tech finally. He politely explained that DELL has a deal with MICROSOFT (most definately for discount purposes) that allows them to produce DELL OEM install discs with keys that will ONLY WORK WITH THE PC THAT THE OS WAS ORIGINALLY BOUGHT WITH.....that's what OEM stands for Original Equipment Manufacturer....

So, to sum up, I think it's a manufacturer by manufacturer thing, becuase I went through the same process to install XP on a Lenovo laptop, and I had no problem using a retail disc with the product key on the sticker on the bottom of the laptop.

Hope this helps....I need to try this Home Vista key with Ultimate disc install thing for myself....I'll post back afterward.

Just to confirm for others, I just installed Vista Home Premium 64 w/ SP1 using my Ultimate 64 w/SP1 disk...it knows from the key which version to install.

Bob