win7, process of file sharing

I want to detect which process (like svchost.exe) in windows-7 is responsible for file sharing and set it’s priority to high.
The problem is that a hardware media player, connected to shared windows folder, sometimes lags when I use chrome or some java IDE.
How can I detect the process to set it’s priority or is there any other way, e.g. playing with HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\PriorityControl\Win32PrioritySeparation?