Songs on MP3 say 'No Authority'?

I have been tryingto load muisc files onto my IMP-65 MP3 player. The files are bought across but when I try & play them it just says 'No Authority'? I understand this means that the CDs on my PC are protected & I need to 'switch off' the COPY PROTECT MUSIC FUNCTION. However, on the Windows Media player when look under TOOLS / OPTIONS there is no RIP MUSIC tab as is suggested in the answer for a similar question on this website!