I use Visual Studio .net as an IDE, so you'll have to look for a similar setting if it's not exactly the same in 2005. Load the project, then go to Project > Properties (the window with all the compile and link options). Choose C/C++ (the compile properties), and under the category "Precompiled Headers", there should be an option similar to "Create/Use Precompiled Headers". Set this to "Not Using Precompiled Headers". Now build the project.