My company has a website built in ASP.NET and targets .NET 3.5. It is too mangled and massive to be converted to .NET 4 in a timely manner. I am tasked with building a ticketing
Have you tried setting the "inheritInChildApplications" attribute to "false" in the parent folder's web.config file?
See Saul Dolgin's answer to a similar question for how to do this.