I want buy desktop pc, which on Running Linux, Windows 7 and Vware Operration System?
Those brands are all good. Especially on desktop pcs, you can always easily change a failing part (just don’t go for the “very small form factor” pcs, and you’ll be fine. If you want to run Linux natively (i.e. not through vmware), then my advice is to not buy the latest hardware. The reason is because Linux developers have access to new hardware after it’s available in the shops typically, so you want to give them some time before buying the same hardware. Also, try to go for very mainstream and cheap hardware if you want to have a high chance of good support in Linux. I mean if 100 millions of that processor were sold, you can bet it has good support in Linux. For Linux, you can find via google search lists of compatible hardware.