Font discrepancy with Vista and Xp

Hi,
I have Parisian font which displays differently on Vista and Xp.
Which is the correct one and why is it changing?
I have my design computer then one connected to my printers. I proof one with my customers but then when come to print it all looks different!
I am enclosed both the font and a snapshot from both computers.
Is it just this font that changes or do I need to double check every single font and design I do just in case this happens again?
Many thanks,
Fungel

Hi,
I was hoping that someone might have some idea as to why this font issue is happening or if it has happened to anyone else?
Thanks,
Fungel.

[shelbym]

I think your XP machine has a different font with the same name. I installed the Font on both XP and Windows 7 and get the same result.

-Shelby