Doing a fresh install of Win8 on a blank HD?

I installed Win8 Pro Upgrade last night. I tried to install XP so that I would have a fully activated OS already on the drive to upgrade from but for some reason I couldn't get XP to install on this new 1TB drive. I ended up just putting in the Win8 DVD and installing it (I was curious if it would work) but of course it won't activate.

I think I know why XP didn't install so I might try again tonight.
OR since I already have Win8 Pro installed should I just try the double install thing?

Are there any technical reasons not to do it this way?

Thanks for the info evildictaitor, I'll just have to make sure my pc calendar doesn't reach 2013.  I have Win 7 to go back to if that happens.

1 hour ago, Geonosis wrote

Thanks for the info evildictaitor, I'll just have to make sure my pc calendar doesn't reach 2013.  I have Win 7 to go back to if that happens.

You'll also need to make sure you don't ever connect it to the Internet. Microsoft licensing stuff connects to the Microsoft licensing server which sends an "authoratative" timestamp that overrules your clock for the purposes of licensing. And Microsoft also goes to lengths to stop you rolling back the clock.

Basically you're fighting the same game with untimebombing your Win8 preview as unlicenced people are against Windows8 RTM (that get a 30 day "grace" period that Microsoft goes to some lengths to stop you expanding into "forever").

If I were you, I'd make sure I back up all of my files because it's gonna get awkward when your machine suddenly dies and you can't get at them anymore.

I managed to install WinXP on my new 1TB drive then did a fresh install of Win8 Pro with the upgrade DVD today. It's quite a process but I guess it's not really what the upgrade DVD was made for.