Hi Doug,
Possibly, assuming the original installation was activated. Since the
hardware has not actually changed (and that's what the hashes are based on),
you may not need to. Won't know until you try. Either way, as it's the same
system, you are well within the EULA boundries for reactivating.
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
http://mvp.support.microsoft.com/
Windows help -
www.rickrogers.org
Vote for my shoe:
http://rick-mvp.blogspot.com
"Doug" <> wrote in message
news:OTg%...
>I built a PC and installed OEM Version of Vista Home Premium.
> I want to partition my Hard drive and reinstall Vista.Do I have to call
> Microsoft ??
> Thank You
> Doug