Welcome to CDFreaks. I'd be happy to help you; just a couple of questions:
1. What is a cs?
2. What is a sasa C250?
Basically, I could do with some more information: are you trying to download music from the internet for use on an MP3 player? Or something similar? If you are having trouble with particular sites quote the exact address (e.g. http://www.sitename.com) and if you are using any external hardware quote the manufacturuer and model number (e.g. Apple Ipod Nano).