Hi, Matty.
Look in the box. ;<)
You should already have both the 64-bit and the 32-bit versions. The retail
package should include 2 DVD disks, but only a single Product Key. You may
choose to install either (if you have 64-bit hardware), but not both. If
you've already installed x64, then you'll need to uninstall that (probably
by reformatting its boot volume or by removing the entire \Windows folder
that holds all its operating system files) before installing the x86
(32-bit) version, perhaps into the same volume.
If your computer came with Vista already installed, the rules are different.
If that is your situation, please give us more details when you post back.
RC
--
R. C. White, CPA
San Marcos, TX
(e-mail address removed)
Microsoft Windows MVP
(Running Windows Live Mail beta in Vista Ultimate x64)