I can open the existing project but i can't make a new project with the same code because of errors in manifest. Can anybody answer me where is my mistake?

here is my project:
http://www.humyo.com/NWtpFv/fw4.rar?a=kqtwZIdYtQE

Works fine for me. I opened the project in msvc 2008, rebuilt, ran it. It also works fine for me, just running the exe from your rar file.

FYI: in general people won't take the time to download and try things for you unless you tell them more.

Can you say more about the "errors in manifest"?

Looking at the mainfiest in your exe, the only potential problem would be if you didn't have the debug c runtime installed, but this is installed with visual studio so that seems unlikely.

What type of new project are you creating? It should be a Win32 project, not a CLR project.