Installing Windows application to a client's computer

Question

I've created a stand alone windows application using Visual Studio 2008 & MS SQL Server 2005.After installing it to a client's computer,It's reports(implemented using crystal reports) a are not working,a runtime error comes.I installed crystal reports runtime also,but still it doesn't work.What I need to do?What are the things I need to install except .net framework & SQL server?Pls help...