I have a new Hewlett Packard dual core processor 2.66GHz 2.67GHz with 3 GB RAM a nd a 32 bit operating system. I have high speed DSL and meet the requirements. The Magicjack is kind of thick, they supply an extension cord and the live help asked if it was plugged right into the PC or on a cord, thought maybe the ord was picking up interference so I had to unplug mouse to make it fit, still bad audio quality. So I tried it on my wifes old PC with Windows XP and a known good phone line, same problem, it simply does not work here.
Others here have used it with good results so I say risk the $39.95 initial purchase whic includes the first year and just keep up with your reciept, you can always return it.