Ok, I've done what was said to be done but i get 6 errors,
Error 1 error LNK2019: unresolved external symbol "public: virtual __thiscall sf::Window::~Window(void)" (??1Window@sf@@UAE@XZ) referenced in function _main Winmain.obj app
Error 2 error LNK2019: unresolved external symbol "public: void __thiscall sf::Window::Display(void)" (?Display@Window@sf@@QAEXXZ) referenced in function _main Winmain.obj app
Error 3 error LNK2019: unresolved external symbol "public: __thiscall sf::Window::Window(class sf::VideoMode,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned long,struct sf::WindowSettings const &)" (??0Window@sf@@QAE@VVideoMode@1@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@KABUWindowSettings@1@@Z) referenced in function _main Winmain.obj app
Error 4 error LNK2019: unresolved external symbol "public: __thiscall sf::VideoMode::VideoMode(unsigned int,unsigned int,unsigned int)" (??0VideoMode@sf@@QAE@III@Z) referenced in function _main Winmain.obj app
Error 5 error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup MSVCRTD.lib app
Error 6 fatal error LNK1120: 5 unresolved externals C:\Users\Ant\Documents\Visual Studio 2008\Projects\app\Debug\app.exe app