PLEASE can anyone help with MP3 problem?

Hi! I am hoping ANYONE willing can help me out?

I received the RCA Opal M4001 MP3 in Sept 2007. At this time, BOTH of my childrens mp3s were set-up on our pc. I tried connecting it & it said "USB Device not recognized". I had tried several more times and eventually, I got it to work and it came with YAHOO MUSIC UNLIMITED JUKEBOX on the software cd so, once installed & the player FINALLY functioning, it worked.

Whenever loaded into Yahoo music jukebox, it functioned but, sometimes, i would have to connect it 4 or 5 times to get it to work so, I took it back and exchanged for a new one.

Same issues occurred. I was always thinking it was because of the way my kids mp3s were hooked up that mine would not work right? Anyways, I continued to mess with it and sometimes it worked well enough to download my music via the yahoo jukebox and sometimes, I got so frustrated, I gave up.

I did not use it for awhile & when I decided to put some new tunes on it, I plugged it in & yahoo music unlimited had been cancelled. I call RCA to see what I could do & they said it should appear in Windows Media Player BUT it doesn't. It is also NOT in the my computer either.

Now, when I plug in my son's mp3, it shows up in my computer as DRIVE E:/ and his name as it was when I set it up (anthonys mp3 was the name I gave it). Could this be interfering with mine & be the reason I cannot use it? The troubleshooter tells me no drivers are installed. I inserted the cd that came with it but, there does not appear to be a section where I see any drivers.

Still, I can plug it in once & it will not be recognized, yet other times, I plug it in & the icon shows on lower right corner BUT, it is still nowhere on the pc. Whenever I uploaded music to it before it was ONLY through yahoo music BUT, rca says it should function with windows media player 10 and it doesn't. When I open the media player, it says no device is connected????? And also, it is still not visible in my computer even when the device not recognized message doesn't show up?

I am pretty sure it has to be something that is with the set-up between my kids mp3's & mine. Can ANYONE please help me figure this out? The RCA people are telling me that I cannot send it for replacement because it has been more than a year and warranty is ONLY for 1 year. I still have the receipt BUT, am sure the store has strict policies about returning/refunding it after SO long.

It cost me $75.00 and I have only used it about 25 times in the time I have had it....can anyone PLEASE help me figure out how to add it to windows media player OR why it is not in my computer as it should be?

BTW... Just FYI...I have a Dell Dimension desktop pc, running Windows XP and Internet Explorer 7. Thanks!
I would appreciate it VERY much!
Thanks!