I am running XP on my C drive and using Vista upgrade disk installed Vista
on my D drive. I need to do a clean install of XP back on the C drive. Can
I do this without messing up Vista? Thanks Carl
Read the Vista license. The license for the OS that was used as the
qualifying version to use an upgrade version of Vista is subsumed into the
Vista license. They become one. Therefore both cannot be installed. It's
one or the other. This was the same with an upgrade license for XP going
from Win95/98/ME/2000. That's why the upgrade version is cheaper than the
full version.
To dual boot with an upgrade version of Vista you need two licenses for XP,
one for the qualifying OS and one for the dual boot.
With only one license for XP you need a full version of Vista.