fast os switching

[reiman]

Is there a way I could switch between two operating systems (in this case
x86 vista and x64 vista) without having to restart my computer?

 

[Alone]

Emulate one of them?

 

[nsafreak]

Not sure what the point would be since there aren't many applications that take advantage of x64 but your best bet would be to load a virtual machine application.