Using Visual Studio 6 writing a C program and getting errors

--------------------Configuration: StockCharter - Win32 Release--------------------
Compiling...
StdAfx.cpp
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\objbase.h(435) : error C2664: 'memcmp' : cannot convert parameter 1 from 'const struct _GUID *' to 'void *'
        Conversion loses qualifiers
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\objbase.h(459) : error C2664: 'memcmp' : cannot convert parameter 1 from 'const struct _GUID *' to 'void *'
        Conversion loses qualifiers
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(68) : error C2733: second C linkage of overloaded function '_memccpy' not allowed
        C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(68) : see declaration of '_memccpy'
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(69) : error C2733: second C linkage of overloaded function 'memchr' not allowed
        C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(69) : see declaration of 'memchr'
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(70) : error C2733: second C linkage of overloaded function '_memicmp' not allowed
        C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(70) : see declaration of '_memicmp'
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(76) : error C2733: second C linkage of overloaded function 'memcmp' not allowed
        C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(76) : see declaration of 'memcmp'
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(77) : error C2733: second C linkage of overloaded function 'memcpy' not allowed
        C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(77) : see declaration of 'memcpy'
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(85) : error C2733: second C linkage of overloaded function 'memccpy' not allowed
        C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(85) : see declaration of 'memccpy'
C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(86) : error C2733: second C linkage of overloaded function 'memicmp' not allowed
        C:\Program Files (x86)\Microsoft Visual Studio\VC98\INCLUDE\memory.h(86) : see declaration of 'memicmp'
Error executing cl.exe.
Creating browse info file...

StockCharter.exe - 9 error(s), 0 warning(s)