C# 2010 hidden files

Question

In a C# 2010 console application it work works fine until it gets to a certain spot. Basically this console application calls another console application.
Here is what is happening:
1. When I run the console application, it runs ok until get reeaches a certain point. At that point is it trying to run the second console application from an  directory path I had a week ago. Then I get error messages from the second console application.
2. Also it looks like I am the only person who can run this application. The application starts and never continues for other people.

I am thinking my problem must be in some file in the C# 2010 solution file.

Thus can you tell me what I can do to resolve my problem?