>i get this message file is in use by another user on one computer on a network of about 20 computers. it is not a server but a client computer. what could be the reason. i have tried rebooting the computer several times already. the other clients where the application is being run are fine.

Please provide more information. Where do the tables reside (on the client machine or on the Network)? Do you use buffering in your forms? Do you use grids for editting? Do you have tables engaged in relation?