Nan, welcome to the forum! Nibiru is absolutely correct in his findings. The app that you want to run may very well work with Windows 7.
Being that you wish to install Windows 7 Pro, entitles you to Windows Virtual PC with XP Mode. While you can do this, there's one thing that you need to know. You need a minimum of 3GB RAM to do this, 4GB would be even better. The reason for this is, the virtual machine (XP Mode) needs to "borrow" RAM from your main install to run, and your regular install needs a minimum of 2GB to run. And when I'm referring to "minimums" here, that's exactly what they are. Enough to get by.
If your program won't run on Windows 7, you can setup a dual boot, where you have your full system power for each OS. I've had several virtual machines of different brands, and the look and feel of the virtual OS is NOT that of one that's a regular install.
What you can do, to see if your program will run in Windows 7, is run the Windows 7 Upgrade Advisor. It can be found at:
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=1b544e90-7659-4b
Follow the instructions carefully.
Hope this helps.
PS: The page that I linked is not the actual page of the product, but leads to it. I have trouble with these long links.
Best of Luck,
Cat