"Rock" wrote
Thanks everyone.
So I really have been duped then. A very expensive mistake. The only
"choice" is to try to sell it or do a clean install I guess.
You can use the disk you do have. Many times it's better to do a clean
install rather than the upgrade, and there is no guarantee, even if you get
a retail upgrade version, that the upgrade will succeed so you're left with
doing a clean install anyway.
Before doing the migration backup your system, better yet image it to an
external hard drive using Acronis True Image Home version 10 so you can
restore if there is a problem. Then run the Windows Easy Transfer Utility
from the Vista DVD on the XP installation to create a copy of the data and
settings. Make sure you have the original media from all installed apps.
How to use Windows Easy Transfer to migrate files and settings from one
Windows-based computer to another Windows Vista-based computer
http://support.microsoft.com/kb/928634/en-us
Then install Vista clean using the OEM disk, use Windows Easy Transfer to
bring in the data and settings, then reinstall all apps.
There are other downsides to using the OEM version. It is not transferrable
to a different computer. By the license it's tied to the first computer on
which it's installed. Also you are responsible for tech support. The
retail versions come with two free support incidents with MS tech support.