Originally posted here by DarkGuardian
In my experience, it's been (in order of preference and security):

1)Win2K
2)XP
3)98
10)ME
Windows XP Professional
Windows 2000 Professional
Windows 2000 Home
Windows XP Home
Windows 98 S.E.
Windows 95
Windows NT
Windows ME
Windows 3.1

If you were going to use Windows, that is how I would rank them.... In my opinion...