C++ debug "cannot find the file Debug\***.pch" & how to debug multi-projects under one solution

When I finished a project under a solution, I found the name of the project was not so good. So I built a new project and copied all the file to the new project. However, it did not work and errored as "cannot find the file Debug\***.pch". The solution was
listed here: 
http://forums.codeguru.com/showthread.php?t=340362
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Re: Can't Cannot open precompiled header file: 'Debug\test4.pch': No such file or directo

right click on the file name in the explorer (under source files)

select properties

select precompiled headers

select "not using precompiled headers"

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 how to debug multi-projects under one solution

Right click your project and choose "set as startup project", it will run this project. And there are no relation between all the projects.