unable to save documents on the network share

Hi,
I just updated an Office 2003 to Office 2007 in one of our PC.

Users can save attachments or new documents to the local desktop or my
docuements, but they can not save new documents to a network share.
The Error ('filename' can not be found. Check your spelling or try
a different path.) This includes Word, Outlook attachments,
Excel.....

The file can be coppied to the network drive after it is save locally.

They can modify existing documents on the network and save but not
create new documents. As part of trying to troubleshoot the
situation, I have given users full control over the share.

This error does not occur in other desktop with same configuration
neither with Office 2003.
Also I installed the office 2007 SP1 but no chnage, I still have this
problem.

thnaks for helping on this

S.