I run VCarve Pro on both Windows 7 Enterprise and Windows 7 Home Premium. The former machine is an HP 8540w with 8Gb RAM, the latter is an Acer 1810Tz with 2Gb RAM. It runs fine on either machine, just faster on the HP.
I ran the evaluation of Aspire on the Acer, it ran fine as well. I decided to buy VCarve because all my foreseeable work is 2.5d.
Sorry, I don't use Mach, I can't comment on that part of the question.