Microsoft office Excell 2007

Every time I launch Excell 2007 I get the error about MSVCR80.DLL not
found. I have reinstalled Office 2007 several times. All other Office 2007
apps launch without a problem.
Microsoft office 2003 was also working without a problem on my pc.
When i launch Microsoft works, I don't have a problem either.

This is very frustrating. Help!
Thanks.