Dll Version problem

Hi all,
My VB app was developed and compiled on a system with windows 98 first edition , now when I install that app on a system with win98 second edition , it overwrites the dlls on the client's machine with its own dlls. thats fine for the app , but then it creates problems for other win programs .... could somebody guide me how to have both the dlls on the same machine and not running into a problem.

Thanks