If you need to get the serial number of a workstation or a server, then this command may be of use to you (not this will likely not work on homebuild systems, but systems like Dell, HP, Lenovo, Acer etc. should work fine) ;
wmic bios get serialnumber
Type it in a command window like this;
WMIC csproduct get name
will get you the product name/model number of the pc (very useful when applying Driver Packs via SCCM with a WMI scope on it, this is the exact model number SCCM-WMI will also get).