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Run msinfo32.exe /categories +SWEnvStartupPrograms /report C:\test.txt
FileReadLine RAM, C:\test.txt, 25
StringTrimLeft RAM, RAM, 22
StringTrimRight RAM, RAM, 7
MsgBox %RAM%

; http://www.autohotkey.com/forum/viewtopic.php?p=225823#225823

VarSetCapacity( MEMORYSTATUSEX,64,0 ), NumPut( 64,MEMORYSTATUSEX )
DllCall( "GlobalMemoryStatusEx", UInt,&MEMORYSTATUSEX )
TotalPhys := NumGet( MEMORYSTATUSEX,8,"Int64"),   VarSetCapacity( PhysMem,16,0 )
DllCall( "shlwapi.dll\StrFormatByteSize64A", Int64,TotalPhys, Str,PhysMem, UInt,16 )
; StrFormatByteSize64 : http://msdn.microsoft.com/en-us/library/bb759971(VS.85).aspx
MsgBox, 64, Total Physical Memory, %TotalPhys% Bytes`n= %PhysMem%

/*

GlobalMemoryStatusEx     : http://msdn.microsoft.com/en-us/library/aa366589(VS.85).aspx
Requires Windows Vista, Windows XP, or Windows 2000 Professional.

typedef struct _MEMORYSTATUSEX { 
DWORD dwLength; 
DWORD dwMemoryLoad; 
DWORDLONG ullTotalPhys; 
DWORDLONG ullAvailPhys; 
DWORDLONG ullTotalPageFile; 
DWORDLONG ullAvailPageFile; 
DWORDLONG ullTotalVirtual; 
DWORDLONG ullAvailVirtual; 
DWORDLONG ullAvailExtendedVirtual;
} MEMORYSTATUSEX,  *LPMEMORYSTATUSEX;

*/