try this:
Have a look here this help me....
1) Go to the C\inetpub\wwwroot folder on any machine that has either/or crystal report runtime engine installations.
2) Copy the aspnet_client folder in the wwwroot directory.
3) Paste this folder in the website directory folder. I assume this would work with a web application that was created from a virtual directory as well, just paste it into the virtual directory.
Crystal-Reports-not-rendering