Software problems. Can I reinstall XP now and use Vista later

I've already made another recent post on this but I really need help. I
recently upgraded from XP Pro 32bit to Vista Ultimate 64bit (Upgrade
version). My problem is that a mission critical program (Adobe Production
Studio) will not run on the 64bit OS. I need help and advice. Can I go back
to my old XP Pro without a licensing hassle and put my Vista on the shelf for
now? Then when my programs are compatible re-upgrade to Vista? Or could or
should I switch to the 32bit version of Vista enclosed in my Ultimate upgrade
then go back to the 64bit at a later time?

You should have no hassles if you reinstall XP and uninstall Vista and put
it on the shelf for now. You may need to do a telephone activation, but if
you explain the situation you should be okay.

"P Renton" <PRenton@discussions.microsoft.com> wrote in message
news:BA08EDA7-4676-4DD2-AD9B-5A6538FAC621@microsoft.com...
> I've already made another recent post on this but I really need help. I
> recently upgraded from XP Pro 32bit to Vista Ultimate 64bit (Upgrade
> version). My problem is that a mission critical program (Adobe Production
> Studio) will not run on the 64bit OS. I need help and advice. Can I go
> back
> to my old XP Pro without a licensing hassle and put my Vista on the shelf
> for
> now? Then when my programs are compatible re-upgrade to Vista? Or could
> or
> should I switch to the 32bit version of Vista enclosed in my Ultimate
> upgrade
> then go back to the 64bit at a later time?