Nero can't save linked multisession tracks. Is there anything I can use to recov

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I had a normal multisession cd. By accident, in Nero, i pressed NEW SESSION instead of CONTINUE SESSION and the original track has disappeared. Someone added without my knowledge a few more tracks on the cd afterwards in the session I accidentaly formed. I tried to save the original track with Nero but i keep getting the "Nero cannot store linked multisession tracks". Please, a little help...i have to recover important data very quickly. Thanks in advance.