i got my flash cable from ebay, and it came with a cd with the usb drivers and some software for flashing. however, the onenand was the 1.4 old version...so i downloaded the new 1.7 from the net. see one of the other threads about the onenand downloader.
when u plug in your cable for the first time, it will ask u to install the drivers twice...do it then restart pc. then u need to go to my computer/properties/device manager and click on ports. what i did next (dont know if correct way, but worked) is change the port setting to 4 for communications port (com 1), then change the cable port to 1. then reboot again. that should be it.