Hi Eric,

>We have replaced the VFP500.DLL with a copy from one of the working machines, >but are still encountering the error.

First of all, copying or moving the DLL from one machine to another will not work. It has to actually be installed

>Our package is installed on 5 different laptops there (all of the laptops are >Toshibas), and the software works on 4 of them. The 5th machine gives the >error "VFP500.DLL is invalid or damaged" when they try to start the software.

I would try a brand new set of install disks and remove all files related to your app and VFP from the machine and reinstall.

I know you may have tried all this but for now it's all I can think of. Beyond this I would start to believe there is something wrong with the notebook or its OS. HTH