PC doesnt recognise MP3 player

Hi All
I would appreciate some help please. I recently bought an MP3 player from eBay, I downloaded a few MP3 files and everything seemed fine. I decided to delete these files from the music folder and load some new ones. I selected the 'delete all' option and the files cleared as they should. This is where the problems started. Now when I plug the player into the PC it doesn't recognise it as a removable drive. The PC makes a noise when I connect the player and when I look in the device manager it's there as 'USB 2.0 (FS) ADFU device' More worryingly is that the player seems to be always on, the only way I can switch it off is to remove the battery. The display of the player permanently displays 'starting...' I have a feeling I may have removed more than just the music files when I deleted. Does anyone know if I can reload the original software/drivers and get it going again ? I am running XP Home SP2.
Thanks in advance