On October 22, Microsoft will finally release a new version of Windows that will be as good as the deeply disappointing Windows Vista should have been when it came out in January 2007. The new edition, called Windows 7, is a big improvement over both Vista and the sturdy, 2001-vintage Windows XP still widely in use. It will give Apple’s long-superior Mac OS X operating system a run for its money (though Apple might maintain its edge with a new version, called Snow Leopard, due in September).

But how will Windows users transition their current computers to the new Windows 7? While this latest operating system stresses simplicity, the upgrade process will be anything but simple for the huge base of average consumers still using XP, who likely outnumber Vista users. It will be frustrating, tedious and labor-intensive.

In fact, the process will be so painful that, for many XP users, the easiest solution may be to buy a new PC preloaded with Windows 7, if they can afford such a purchase in these dire economic times. In fact, that’s the option Microsoft recommends for XP users. (Conveniently, this option also helps Microsoft’s partners that make PCs.)

By contrast, if you’re using Vista, the upgrade to Windows 7 should be a fairly easy, straightforward process. Because the new version shares most of the underlying guts of Vista, it installs itself on your current machine relatively quickly and smoothly, preserving all your files, folders, settings and programs. In a test of this process earlier this year, using a pre-release version of Windows 7, I upgraded a Vista laptop with no problems and little effort in about an hour.

But Windows XP users, including the millions who have recently snapped up cheap, XP-powered netbooks, will first have to wipe out everything on their hard disks in order to install Windows 7. on their current machines. In fact, Microsoft doesn’t even call migrating to Windows 7 from XP an “upgrade.” It refers to it as a “clean install,” or a “custom installation.” This disk wipeout can be performed manually, or automatically during the Windows 7 installation process.