Ошибки при добавлении проекта

C:\Program Files\Microsoft Visual Studio .NET\Vc7\Include\xstring(1286) : error C2143: syntax error : missing ';' before 'std::basic_string<_Elem,_Traits,_Ax>::npos'
C:\Program Files\Microsoft Visual Studio .NET\Vc7\Include\xstring(1286) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
C:\Program Files\Microsoft Visual Studio .NET\Vc7\Include\xstring(1286) : error C2888: 'basic_string<_Elem,_Traits,_Ax>::size_type size_type' : symbol cannot be defined within namespace 'std'
C:\Program Files\Microsoft Visual Studio .NET\Vc7\Include\xstring(1286) : fatal error C1903: unable to recover from previous error(s); stopping compilation