I also have the same problem.... I just recently got athe USB t0 MIDI cable from amazon
http://www.amazon.com/Cable-Converter-Music-Keyboard-Window/dp/B0047ANFWY
i've connected the ports properly and the driver for the cable also got installed automatically in my win 7 machine.... then i started the vyzex editor and i get the same message shown in the screenshots by romulomolero ... Kindly help.