Vista Ultimate dual boot x32 x64?

[Fireburst]

I have been lucky enough to win a copy of Vista Ultimate retail (from the Microsoft developer launch competition) and I was wondering if it is possible to install both the 32 and 64 bit versions on the same computer to dual boot?

I would be nice to have the 32bit version to fall back on for those pesky apps which dislike x64

 

[Dogoid]

technically yes, just don't install them both on the same hdd.