Gellins Base Error

1>------ Build started: Project: CaBase, Configuration: Release Win32 ------
1>Compiling...
1>Misc.cpp
1>Menu.cpp
1>DirectX.cpp
1>Base.cpp
1>.\Base.cpp(254) : error C2365: 'Sleep' : redefinition; previous definition was 'function'
1>        C:\Program Files\Microsoft SDKs\Windows\v6.0A\include\winbase.h(4282) : see declaration of 'Sleep'
1>ADE32.cpp
1>Build log was saved at "file://c:\Users\....\Desktop\My Combat Arms Hack\CaBase\Release\BuildLog.htm"
1>CaBase - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========