Trouble parsing WMI output

Hi, 

I would really appreciate some help on this as well as a resource recommendation where i can learn this stuff...

$OS=Get-WmiObject -ComputerName ROS420DVAPP01V -Class Win32_OperatingSystem | Select Name

$OS.name contains

Microsoft Windows Server 2003 R2 Standard Edition|C:\WINDOWS|\Device\Harddisk0\Partition2

I really need to just grab everything before  the 1st "|" into the $OS variable,

Thank you