The guys from Firingsquad published another troubleshooting Windows Vista x64 session on their website:
With Microsoft pushing for increased x64 adoption with Windows Vista, going as far as including a 64-bit DVD with all retail boxed versions of Windows Vista Ultimate, and the advances to kernel security in Windows Vista x64, the time is perfect for transitioning to a 64-bit Windows...isn’t it?
To put this to the test, I decided to install Vista x64 on four different computers: my own, my brother’s, and my parents’. My original plan when starting this project was to document the software incompatibilities and idiosyncracies of Vista x64. It would turn out that I would have more than enough material for an article just talking about installation troubles.