DDE Server Window: vb5.exe - Application Error?

It probably has something to do with your installation program. Certain dlls are not being copied or registered correctly on the given operating system. Are you using the package and deployment wizard? If so, you might try repackaging it and reinstalling it. If you have access to other programs like Wise or InstallShield, use those instead. (You can try the trial versions if you'd rather not buy them.) You could also manually install the program by copying the .exe and the dlls and registering them all manually. This is a pain, but it should fix your problem. Good luck.