Hi Binaural,
yes you could buy another HDD and take out the "Windows 7 HDD" and re-install everything from scratch, if this works 100% as you want it to I do not know.
You could build another machine for 64 bit only and keep your Windows 7 machine untouched.
If you need to use more RAM on your computer (the reason why you wish to use Live 10 instead of 9)-Vienna Ensemble Pro is a good software for VSTi / fx and you use a slave machine.
But Live 10 is 64 bit only - How inconsiderate of them -

- Only joking, but eventually all 32 bit goes but you've got Live 9
What does Live 10 offer that 9 does not? - For Scope I would run in 32 bit mode then all scope devices work 100%-If you go 64 bit there are advantages but some of Scope may not work like STS Samplers or what ever else that you may never use ???
For me Scope / Xite will be run 32 bit mode with VEP Pro 5/6 etc....
UAD would be run in 64 bit mode and that is where Live 10 would be used / Reason 10 etc....
Take your pick and juggle the balls that are the marbles in your mind -

- And live happily with working systems -
