Free Physical Memory
c:\> wmic os get FreePhysicalMemory
Free Virtual Memory
c:\> wmic os get FreeVirtualMemory
Total Physical Memory
c:\> wmic MEMLOGICAL get TotalPhysicalMemory
Total Virtual Memory
c:\> wmic MEMLOGICAL get TotalVirtualMemory
% Physical Memory used
(1-(FreePhysicalMemory/TotalPhysicalMemory))*100