Relatively unsophisticated, but trying to install Rockbox on C250. Can't detect. Cannot figure out how to fix this. Attempt gets "configuration invalid" Config window shows Sandisk C200 but if I click on it, nothing happens. Will not autodetect. Next screen shows C drive and other USB devices, but not the C250 which appears in My Computer as portable media player. Connection to PC "works" as I have been able to populate with CD's, via Windows Media Player, after having installed CD's with Winamp and ended up with MPEG4's, which I cannot play with the C250. Hence my interest in rockbox.