Related to MTS

Hello,
we have developed a setup file for our application usuing Installshield Software..it is working nice in our organisation.i tried it on different sytems..it is working nice.but when we sent it to our customer ,there..it is giving an error like...

"error in loading Dll".

what actually our setup will do is...

it will take all needed Dlls and files from our system and it will create a new directory on the targetsystem and it will copy those dlls and .pak file into that created directory and will be launching an application using VB..which will import the package using above copied Dlls and .PAK file and will create a package in MTS.
This is the actual procedure ...in this process..some where the error

"error in loading Dll" is coming......

Are you sure you also package all files that the others dll's may have dependencies on?