Many PCs I encounter had no or outdated motherboard drivers. Some have incorrect wiring on the front ports.
Sadly your post tells nothing about the host PC.
I'm new to mp3 players so I was given a Rio s30s to try but when I plug into my computer or laptop (both xp) it starts to install but then says software not found.I downloaded the software and drivers but cannot get it to detect the drivers. I'd like to be able to try it out but don't know what else to try. I've uninstalled and reinstalled it but still nothing. Any advice would be great