office 2000 [excel] cannot open previously OK file. Help
 

When trying to open a Microsoft Excel Work Sheet that I had accessed modified
and saved to only yesterday [Office 2000] a window pops up with:
"name.xls cannot be accessed. The file may be resd-only, or you may be
trying toaccess a read only location. Or, the server the document is stored
on may not be responding."

Older files stored on the same mediums ;HD, Flash memory or 3.5in. diskette
are accessed with no problem.

This is on a network drive?