You'll probably need to contact firstname.lastname@example.org
for them to investigate further - however something's I'm sure they will ask are:
How did you do the XP - Win7 Upgrade?
In place OS upgrade or complete new install?
Did you backup your Myriad Data before starting the process? If so / how / where?
Have you checked in the Audiowall folder to see if you can see the myr******.wav files? Can you play them in Windows Media Player?
Did you have the audiowall set to allow different audio file types (mp3) on the previous installation? Have you replicated those settings on the new system?
Those are the things I would start looking into.
Hope this helps.
Broadcast Radio Ltd