New
#21
I can't believe no one in here did a simple Google search for wmpnetwk.exe.
To the original poster - Do you have an XBox or a Media Center Extender and have you tried to share music or movies from your PC with it? If so, or even if not, you need to disable media sharing within Windows Media Player. This will eliminate the issue with wmpnetwk.exe.
Having a process that runs constantly above 50 CPU and 900K RAM is a HUGE red flag that something is wrong regarding that process.