Full Retail?
I do have a prior version -isn't that OK?
-Pete
Here are some considerations:
If your prior version is currently installed on another system then you
can't use it to run a Repair Install on a second system as it would then be
installed on more than one system and violate the License Agreement. If your
prior version is an OEM version that was previously installed on another
system you cannot use it on a second system even if it is no longer
installed. That is the way of OEM versions. If your prior version is XP Home
then it will not be useful as "pirated versions" are XP Professional and you
can not run a Repair Install overtop XP Pro using XP Home. If when you boot
the system with the prior version and after you accept the License Agreement
(press F8) and you do not see a screen that tells you a version of Windows
XP was found would you like to attempt to repair - press "R", then you won't
be able to run the Repair Install.
However if your prior version is not currently installed, is not an OEM and
is Windows XP Pro there is a good chance that you can simply run it overtop
of the pirated version and make it legal.