error while opening excel file

Hi

I am getting two errors while opening excel file.

“7F4DCDE3.xls” could not be found. check the spelling of the file name and verify that the file location is correct.
If you are trying to open the file from your most recently used files……..”

“errors were detected in opening “codingsheet.xls”, but microsoft was able to open the file by making the repairs listed below………
damage to the file was so extensive that repirs were not possible…….”

Rest of the excel files open fine in my application but one.
The above error occurs only in few PCs.(standard image PC running Windows XP SP2 and MS Office 2003 SP3)

I have tried the below measures but none of them cud solve me problem…

1) unreg and rereg excel
2) editing regedit