I have a PRS-505 and I work with it in WIndows XP SP version 2002 SP3.
The PSR-505 is at the most recent level of firmware.

I have a problem with the hardware not being recognized.

My only work around is to:

1. Plug in the book from USB
2. Uninstall the reader from the device manager
3. Unplug the book from USB
4. Turn off the book
5. Plug in the book to USB

THis is rediculus. Every time.

I have completely uninstalled every USB device from the device manager's USB root and uninstalled the Sony software.
I thought I had the issue resovled after I rebooted, but upon the next reboot the problem is back.

Any ideas?