USB Drivers for DGX620

Hi, I'm looking for a driver for my Yamaha DGX620, portable grand. Apparently, though a songbook and CD including USB drivers was suppose to be included in the package for my DGX620, they weren't. I've tried searching for a site that offers driver downloads, but I've had no luck so far. Any ideas?

-Kat Kellermeyer
thechickwhopwn3dyou@yahoo.com


PS: I would go back and ask about this problem (things not being included) but I purchased this digital piano about a year ago from a warehouse store, and I haven't been able to play well enough to want to hook it up to my computer until now. Would going back now be a futile effort?