Buy something without an OS (or if you must buy something with the OS of your choice) then configure it to be either a multi boot system or use a virtual machine. That way you can have the best of n (up to 3 in case of multi boot) worlds.
For all 'serious' stuff I use Ubuntu nowadays, mainly because it runs so much faster than Windows -- not insisting on gazillions of background processes I have no clue what they do, yet whenever I close something running on my name causing a Blue Screen of Death. And come to think of it, it's almost easier to work with than Windows too -- mainly because a lot of stuff can be directly run/killed from a commandline without much trouble.
@Fragony: dunno, but you could of course -- just remove all the components. If it's Unix it doesn't have such nonsense as registry meaning... locate it and use rm to remove it.
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