Impulse, WB7, and registrations

Hi. I hope this is the place to ask this. I d/l'd Windowblinds 7 for my netbook, installed in on the 30 day trial. The 30 days expired and everything reverted to WinXP. I had paid for WB7 within the 30 days, I think, as I have the Stardock replies in email. In the email it says to install Impulse to d/l WB7. So altho WB7 is already d/l'd and installed, I d/l'd  Impulse, too. It asks for a registration number. The Stardock email has what I think is a long alpha-numeric registration number but Impulse won't accept that (or the few days later) number. I have verified the difference between "Os" and zeros so that's not the problem. What shall I do so I can go back to using WB7? Thanks.