I tried Win8 Pre Milestone 3 into my laptop too (Win7) works fine on my laptop!
but why to use Win8 M if we can make Win7 Looks Like Win8
and Win7 SP2 include Win8 Fetures and more something nice...

55 GB of HDD space and XP? That's REALLY BAD (no offence!)
But the 55 GB of HDD space is the one that is really BAD (no offence again!)

I know It's really bad, but I only tried!
If someone test or have Win8 M then If you want make It faster then go to settings and disable Aero, etc. :P

And now I use Win Vista in really bad PC and It's works normally!

Talking about bad:

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First, the specs:





The DVDrom is long gone, so the guy installed by USB flash stick, and look.......working aero!