Error Occurs : "Could not load file or assembly 'Microsoft.Reportviewer.Winforms Version=10.0.0.0" while generating Report

I created an application using .net 4.0 in which there were two forms. First form accepts the data from the user and the second form contains the report viewer control which generates the bill. The image of the Data Entry form is this The image of the generated bill is this As I wan to run this application on different computer systems,I made this application compatible to .net 3.5 framework. It was converted successfully but the this error occurs when I click on the Print Button. Please help me how to tackle this error? Thanks in advance.