Can you help with EXCEL found unreadable content?

EXCEL FOUND UNREADABLE CONTENT
I copied and pasted data from Excel 2010 to Excel 2007, the formulas are simple and I used some colours to highlight certain cells and then I saved the document and exited. But when I want to open the file again I get the message Excel found unreadable content. When I click yes it removes all text formating and I lose all the colours I need to group important cells. Do you have a solution?

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