If the O/S came with a new fast desktop computer then I don't see why not, the problem is many laptops comes shipped with Vista with a rather slow CPU and only 1-2GB of ram, give many people an extremely and unfairly poor taste of Vista!
Slow CPU's with only 1-2GB of RAM actually isn't that bad with Vista, my EeePC is pretty much exactly that, and Vista runs more than comfortably with it. I think the real problem has two sides to it.
On one side, you have all the computer manufacturers that in the beginning of Vista's life were putting out machines that barely match the Vista requirements(Slow Processor and only 512MB of RAM with a shit graphics card) and installing Vista on them. Hell, XP doesn't even run that well on 512MB. They tried to get away with what they were used to doing, and that is putting out completely crap machines that barely ran the OS and charging huge markups on them. This just put a bad tast in peoples mouths, and it has stuck.
On the other side, you have all the poeple that have never tried Vista that just constantly get told by the Internet and other sources that Vista is a resource hog, and it runs like shit, and it is buggy as all hell, and they decide, without ever actually using the OS, that they don't like it. And a lot of the time they spread the same misinformation themselves, which continues to make the problem worse.
That just shows you do not understand the medical industry or the cost of changing systems. Yes it is possible to change but for a under 50 employee business it would cost hundreds of thousands to change systems. That is in no way cost effective, especially when the GE products are still in the top grouping.
I understand the medical industry greatly, besides supporting several medial offices myself, I have a very good friend that works for a large ~20 Doctor Practice as their head of IT. When Vista came out, it was one of his main projects to test Vista with every single IT product in the building, including all their GE equipment. All if it worked, and furthermore, GE supports everthing despite their use of Vista. If you buy multi-million dollar machines from a company, they are going to support it.