ITunes does not play well AT ALL with Windows. Since your library is in ALAC format, Get the free Foobar software media manager with ALAC decoder module, and activate one of the better software audio drivers (included) such as WASAPI Event. If at all possible, set your computer output to max volume and use the best hardware volume controls that you have downstream.
Or, convert your ALAC files to AIFF and buy JRiver which is a more user friendly setup than Foobar, but doesn't support ALAC very well.
Or, convert your ALAC files to AIFF and buy JRiver which is a more user friendly setup than Foobar, but doesn't support ALAC very well.