I have an existing VC++ DLL that uses Boost library version boost_1.35. Now I have to convert the entire source code into 64-bit. So I changed the compiler to 64-bit by simply going into Configuration Manager>Platform and selected X64. Now compiler throws these errors which I presume are related to Boost libraries

Code:
Error	41	error LNK2019: unresolved external symbol "private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __cdecl boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)" (?do_assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@AEAAAEAV12@PEBD0I@Z) referenced in function "public: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __cdecl boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::assign(char const *,char const *,unsigned int)" (?assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@QEAAAEAV12@PEBD0I@Z)	BrowserCaps.obj
Error	42	error LNK2001: unresolved external symbol "private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __cdecl boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)" (?do_assign@?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@AEAAAEAV12@PEBD0I@Z)	Config.obj
Error	43	error LNK2019: unresolved external symbol "private: void __cdecl boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::construct_init(class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > const &,enum boost::regex_constants::_match_flags)" (?construct_init@?$perl_matcher@PEBDV?$allocator@U?$sub_match@PEBD@boost@@@std@@U?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost@@AEAAXAEBV?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@3@W4_match_flags@regex_constants@3@@Z) referenced in function "public: __cdecl boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >(char const *,char const *,class boost::match_results<char const *,class std::allocator<struct boost::sub_match<char const *> > > &,class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > const &,enum boost::regex_constants::_match_flags,char const *)" (??0?$perl_matcher@PEBDV?$allocator@U?$sub_match@PEBD@boost@@@std@@U?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost@@QEAA@PEBD0AEAV?$match_results@PEBDV?$allocator@U?$sub_match@PEBD@boost@@@std@@@2@AEBV?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@2@W4_match_flags@regex_constants@2@0@Z)	BrowserCaps.obj
Error	44	error LNK2001: unresolved external symbol "private: void __cdecl boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::construct_init(class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > const &,enum boost::regex_constants::_match_flags)" (?construct_init@?$perl_matcher@PEBDV?$allocator@U?$sub_match@PEBD@boost@@@std@@U?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost@@AEAAXAEBV?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@3@W4_match_flags@regex_constants@3@@Z)	RequestHandler.obj
Error	45	error LNK2019: unresolved external symbol "public: bool __cdecl boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::find(void)" (?find@?$perl_matcher@PEBDV?$allocator@U?$sub_match@PEBD@boost@@@std@@U?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost@@QEAA_NXZ) referenced in function "bool __cdecl boost::regex_search<char const *,char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >(char const *,char const *,class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > const &,enum boost::regex_constants::_match_flags)" (??$regex_search@PEBDDU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@YA_NPEBD0AEBV?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@0@W4_match_flags@regex_constants@0@@Z)	BrowserCaps.obj
Error	46	error LNK2019: unresolved external symbol "public: bool __cdecl boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::match(void)" (?match@?$perl_matcher@PEBDV?$allocator@U?$sub_match@PEBD@boost@@@std@@U?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost@@QEAA_NXZ) referenced in function "bool __cdecl boost::regex_match<char const *,class std::allocator<struct boost::sub_match<char const *> >,char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >(char const *,char const *,class boost::match_results<char const *,class std::allocator<struct boost::sub_match<char const *> > > &,class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > const &,enum boost::regex_constants::_match_flags)" (??$regex_match@PEBDV?$allocator@U?$sub_match@PEBD@boost@@@std@@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@boost@@YA_NPEBD0AEAV?$match_results@PEBDV?$allocator@U?$sub_match@PEBD@boost@@@std@@@0@AEBV?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@0@W4_match_flags@regex_constants@0@@Z)	RequestHandler.obj
Can someone help me in resolving this? Do I need a whole new 64-bit version of boost libraries? If yes where can I get the instaler? As compiling boost libraries itself is a big big mess