C# executables on my workstation

Question

When I am calling a process in C# 2008, some executables are located and executed instead of the executable I am tyring to run.
  Thus these old executables must still exist on my workstation since those paths look familar to  me.
  Due to this fact, I have the following querstions to ask:
  1. What would cause these executables to still exist? In the application I am working on, what do I need to do to make certain more executables are not created?
  2. How do I locate the existing executables that are on my workstation?
  3. How do I remove (delete) these executables from running?