invoking an exe through a webpage (Asp.net) throwing error message "No application is associated with the specified file for this operation"

Hi

We have one webpage (asp.net and c#) we are invoking an exe through this page using below command.

Process.Start(strRACFexe, ddlIDType.SelectedValue.ToString()+ " "+ ddlEnvironment.SelectedValue.ToString()+ " "+ strRequestNo);

This exe basically sleeps for 5 min and then reset pwd Teradata servers id. Earlier it was working fine but now we have observed that this webpage start throwing error after some time and then keep throwing error until and unless the app_pool of the website is not recycled. We also observed that there is high usage of memory for w3wp processes. AS soon as we recycle app_pool or kill the w3wp processes the web page will start working.

any suggestion and idea will be highly appreciable.