I was having problems to with the usb drive. Sometimes it went missing or I would get a cycle of autostart and search on it or windows telling me that I had it into the wrong port etc.
I ended up just dl everything to my hard drive and I think its alot better this way. Generates faster but, I had no choice.

This link should help you to reset...

http://www.pgmusic.com/techfaq17.htm#97


6 strings. 24 frets. An infinite amount of possibilities.