My Clip+ is full, how can I delete via computer when clip not recognized in Device Manager

[annca]

I gave my sister a Clip+ and she’s returned to me totally frustrated and now I see why. My computer does not recognize that there is anything on the Clip+ when it is full. Meanwhile, I can’t even upgrade the firmware because it’s full. Please, please, please do not tell me to delete song by song on the Clip+. I’ll be up all night. I’ve already tried a new cable and at least now the Clip seems to hold a charge which it did not do before.