Background program
A background program is a program that runs while the user is working on another task. The computer’s microprocessor assigns fewer resources to background programs than to foreground programs. [Source]
Foreground program
A foreground program is a program that runs in the active window (the upper-most window with the highlighted title bar). The foreground program responds to commands that the user issues. [Source]
Open the System Properties (Right Click on My Computer > Properties > Advanced system settings). Go to Advanced tab and choose Settings of Performance.
Under the Processor scheduling, select to choose of which the best adjustment for Programs (foreground) or Background services. Click Apply and OK.
