check here

http://support.microsoft.com/kb/918165

--
HTH
Nick Hodge
Microsoft MVP - Excel
Southampton, England
www.nickhodge.co.uk
HIS


"dwhitmarsh" wrote in message
...
My excel files will not open either from my documents or from a shared
server
file.
I had a problem with saving word documents yesterday but fixed it by
changing a line in the regedit.
Is this related and how do I fix this one?

thanks