Cannot save excel file after installing Office XP Sp3
 

I have a sheet which refreshs data from an external source (IBM AS400) to
build up a daily history. After installing SP3, I cannot save the file back
to ANY location, either network drive or local hard disk. I can't even "save
as". The error message is 'Document not saved'. But, if I "save as", and
overwrite the original document, it tells me that the source drive or
document may be read-only. This is not the case, as I have full
administrative privileges to the drive, folder and file.

Anybody got any ideas??