I have a client who is curious about this.
I'm not sure if win 7 32 or 64 bit makes any difference.I have a client with Draw 12 wondering what will happen if they buy new laptop. Draw 12 works for their needs.Like many, they're concerned that they'll have to upgrade lots of other software also, potentially exceeding the 800.00 cost of the laptop/win 7 itself.
I had problem with installing CD Graphics Suite 12 on Windows 7. The problem was some bug in system. If you have problem with installation of Corel on Windows 7, maybe this can help: http://www.blackberryos.com/blackberry-how-guides/2223-windows-vista-7-dreaded-error-2738-fix.html
Similar problem might be on Vista. Just try searching for the error number, that might show up. And make sure, you have installed Update for Windows Vista (KB951978).