error when free dowloading

when downloading music files they are asking for serial no. in a window.Earlier i downloaded files but this kind of thing didn't happen what will be the reason?
and please suggest me good free music downloading site

ravishki said:

please suggest me good free music downloading site

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This itself is illegal

You've PMed multiple people for this, and were told that we don't support piracy.

Since it wasn't clear to you the first couple of times:
Please refrain from piracy discussion.

Feel free to discuss other aspects of computing or if you need help with something else and we'd be glad to assist.