Need to execute *.exe in server from ASP.net

Question

My current situation is that I need to execute an exe(which creates a local .txt file) in remote server with IIS hosting an ASP.net/C# API. I created a local user(say userA)

Answer 1

UPDATE: I managed to solve the issue after many weeks. Thank you all for your contribution. Apparently IIS does not load windows user profiles by default. So when running as a different user who is not logged on, their windows profile must be loaded by IIS. In advanced setting menu of your app pool, there is an option "load windows profile" I just changed this to true. In prior versions of IIS, this was set to 'true' by default.

Related questions on SO with same solution:

1) Security exceptions in ASP.NET and Load User Profile option in IIS 7.5

2) Running a asp.net web application project on IIS7 throws exception

3) System.Web.AspNetHostingPermission Exception on New Deployment

Another 4) http://geekswithblogs.net/ProjectLawson/archive/2009/05/05/iis-system.web.aspnethostingpermission-exception-on-windows-7-rc.aspx