Windows 7 – Win7, process of file sharing

I want to recognize which process (such as svchost.exe) in Windows 7 is responsible for file sharing and set its priority to high.
The problem is that a hardware media player connected to a shared Windows folder sometimes hurries when I use Chrome or a Java IDE.
How can I identify the priority setting process, or is there another way to do it? play with HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Control PriorityControl Win32PrioritySeparation?
Many Thanks.