Getting error message when trying to open Excel
 

We recently upgraded from Office 03 to office 07. Now when I try to open
Excel worksheets that have connections to access databases, I get the
following error.
"Selected collating sequence not supported by the operating system." Does
anyone have any ideas how I can fix this. I have looked through and found
some articles but they are for older versions of office. Any advice or
suggestions would be greatly appreciated.