Turn off firewalls and antiviral software. Download Impulse. Install it. Put in the email you ordered the software from. Close it and reopen. If the transaction went through Impulse should update with your registrations. If all's well the software should appear under the tab marked desktop. If not, don't despair. Wait for the confirmation email and turn your protection on again.
When downloading with Impulse, make sure the protection is off. When done, turn it back on again.
Look at Island Dog's tutorials/walk throughs of Impulse (they are under his articles on his personal page). Watch them so you can navigate around Impulse with some confidence.
I'll check back to see how you're doing.
Welcome...and enjoy the software!
