Well, you can do just exactly that by using a unique product called Zinstall XP7.
If you are a PC hobbyist migrating to Vista as much for the sport of it as anything else, then you should certainly follow the upgrade path.
If you are moving to Vista because you like the new features, but aren't necessarily up for a project, then keep reading.
If you've decided that Vista is worth the investment, should you upgrade your existing PC to Vista, or buy a new PC with Vista preloaded?
The answer depends on how much money and time you're willing to invest.
This means you can try out Ubuntu while also keeping your Windows installation.
In a traditional dual-boot system system, Windows is installed alongside Ubuntu and each OS has its own partition.
Assuming you have a legitimate copy of Windows installed on the PC you intend to upgrade (the Vista installer will check to see if it is a licensed copy), then your out-of-pocket will be the upgrade price.
A Windows Vista Home Basic upgrade pack will cost you only .95, but this stripped-down version lacks most of the sexiest features of the OS, such as the slick Aero interface.
Your decision ultimately should be based on the amount of money and time an upgrade entails in your particular situation—and how that compares to the money and time required to purchase a new PC and get it reloaded with the apps and files you need.
Your first consideration in the upgrade-versus-buy debate is the cost of the operating system itself.
(Or manually change them - "TOO RISKY" - they say)3)Manually hexedit all relevant path statements to the new path in the files.4)Double click all the reg files to update the windows registry.5)Search C:\ for any files containing text "C:\Program Files (x86)\XYZ" and (individually, I'm afraid) change this to D:\Vista Programs\XYZ.