file error. Data may have been lost

"file error. Data may have been lost" - I recieve this error when trying to insert worksheets into excel 2007. Does anyone know what might cause this. I have installed all of the updates. Thank you.

 

Does this happen on any workbook, or just some specific ones?

Is the file on your hard drive, or on a network drive?

If an existing workbook, does it have linked data from another source?

Is the file an XLS or an XLSX?

Does this happen to a brand new workbook stored on the local hard drive?

 

It happens when opening a new workbook or working from an existing workbook. It can be stored locally or on a network drive. There may or may not be linked data.

 

And...the file would be an XLSX as we are dealing wtih Excel 2007.