delphi 2/reportsmith 3.0 connect problem!

Hi everyone:
    I used delphi 2.0/reportsmith 3.0 to develope a
application. things work well on my computer. I used
installshield to geneate a customer verions and
installed on customer computer. but my custmor can not
run the rs_run.exe on his pc and generate a error
' unalbe to load database access dll'. I could not
solve the problem.
     If anyone knows the answer, pls tell me.
thank you very much.
Wei Jiang