One thing to check is what kind of USB settings are you using in the MP3 player? Your's may be different, but in mine in the settings for USB, I had two different options. I could set it for MTC or MSC. When I had it set for MSC, it didn't work in Vista. But when I changed it to MTC, Vista recognized it correctly and it worked. Your's may not work the same way, but that is something you could check.