Can't buy Windows7, 'buy window' won't show all fields

Now here's a stupid problem - I have a trial copy of parallels on my Mac Air (latest greatest) and when I go to buy a copy of Windows 7 via the parallels apps, the buy window that comes up on my Mac Air will not let me scroll down to all of the fields that I need to complete for my purchase. Yes, I am a novice Mac user and I also know this may not be the best way to purchase Windows 7 for this setup but it seemed like the easiest way to go. Any pointers appreciate. Thanks ....

 

To answer my own question, the problems are indicative of my having a trial copy of Parallels, which makes the 'trial' fairly useless (unless I already had a copy of W7 to use). I appreciate the quick response via email from their support though.