Windows 7 Professional, in all areas this is better, performance, reliability, ease of use, power usage.....
Windows ME was written to replace Windows 98. It crashed frequently. People replaced it with Windows 98. Microsoft quickly replaced it with Windows XP, which works much better.
Professional
windows, mac is stupid and its hard to use because its a useless piece of junk. and microsoft windows has a better product and is more popular than a mac.
Windows Xp Professional.
It's windows Xp Professional because it's the one i am using.,
"SP3", or service pack 3, is a cumlative set of security and bugfixes for Windows XP, both the Home and Professional editions.
i think it is much bette than windows xp because it is new and updated version, it is alot faster than xp, its theme is a whole lot better/nicer and it is easier to use i do not know about vista because i do not use vista
professional
Microsoft claim that Windows Server 2003 delivers a better performance than Windows 2000, and is more user friendly. It provides a backup system for lost files.
No offense but the question answers its self....upgrade XP Proffesional to Windows 7withWindows 7 home premium to Windows 7 professional upgradethe disk upgrades Windows 7 to a better version, and as such has nothing to do with windows xp
If you are installing it from Microsoft website then the answer is Yes. Microsoft will ask you to pass validation. If you have a stand alone copy of it, then you have to disconnect your PC from Internet and istall it, in such cases it's better to have firewall (windows firewall doesn't work in such cases).
Windows can be installed and run on any Mac (and Ironically windows 7 runs better on a mac than on a PC due to how the graphics are set up)