problem saving to a shared folder on a server

Hi all

I have a problem with saving to a shared folder on a server using office
2007.
I keep getting a message that states that the file is already in use. It has
happened before. I overcame this by uninstalling office and reinstalling it,
it works for a couple of weeks then it does the same. All users (3 of them)
have full access rights to this folder and only one is having this problem at
the moment. It happens even if I try to save a new file.

Any help is much apreciated.
Regards johann