I am new to this site but I feel I can be very helpful so I would like to contribute.
I haven't seen anyone on here with Parallels 7 yet and I actually installed and using the program now, and works perfectly and registers.
Give it a try if you want to add windows on your Mac so you can use PC software which might not be available for Mac kinda deal.
How to install guide:
open Terminal. Paste in "sudo nano /private/etc/hosts" without the quotes. Enter your password if prompted.
-Scroll down to the bottom of the terminal text editor and paste in these lines:
-Hit ctrl O to save, then ctrl X to exit.
-Install, Use enclosed Serial
-Click activate, then click X in the top left to skip registration on the next screen.
I hope you enjoy it.