Please Help! DSETUP.dll not found

[Monge]

Hello all,
I have an account running on my home pc and wanted to get the wife playing on our laptop. I installed everything exactly the same as the first time as far as i know, but when I try to launch the game on the laptop I get the error:
"This application has failed to start because DSETUP.dll was not found. Re-installing the application may fix this problem."

I was wondering if there is a way to fix this problem so we could both play together?

Any help would be appreciated! Thanks much!