error LNK2019: std

In VC7 I got this link error:

filesys.obj : error LNK2019: unresolved external symbol "public: bool __thiscall std::locale::_Iscloc(void)const " (?_Iscloc@locale@std@@QBE_NXZ) ，This symbol is in the function "class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > const & __cdecl std::use_facet<class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > >(class std::locale const &,class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > const *,bool)" (?$use_facet@V?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@@std@@YAABV?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@0@ABVlocale@0@PBV10@_N@Z) is referenced
filesys.obj : error LNK2019: unresolved external symbol "public: class std::locale::facet const * __thiscall std::locale::_Getfacet(unsigned int,bool)const " (?_Getfacet@locale@std@@QBEPBVfacet@12@I_N@Z) ，This symbol is in the function "class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > const & __cdecl std::use_facet<class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > >(class std::locale const &,class std::num_put<char,class std::ostreambuf_iterator<char,struct std::char_traits<char> > > const *,bool)" (?$use_facet@V?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@@std@@YAABV?$num_put@DV?$ostreambuf_iterator@DU?$char_traits@D@std@@@std@@@0@ABVlocale@0@PBV10@_N@Z) is referenced
filesys.obj : error LNK2019: unresolved external symbol "void __cdecl std::_Xlen(void)" (?_Xlen@std@@YAXXZ) ，This symbol is in the function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::append(unsigned int,char)" (?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ID@Z) referenced
filesys.obj : error LNK2019: unresolved external symbol "void __cdecl std::_Xran(void)" (?_Xran@std@@YAXXZ) ，This symbol is in the function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::assign(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int,unsigned int)" (?assign@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ABV12@II@Z) is referenced
What's wrong?

[4634 byte] By [Fatt] at [2008-2-23]