how to improve myWin XP PC audio?

I use my older PC that runs on Win XP, I already have 80% of my CD ripped using iTune Apple Lossless. data is fed to Benchmark DAC USB via USB, Benchmark has Parts Connexion mod. can't figure out how to configure ASIO in iTune, according to Benchmark website I can do without ASIO.

a friend brought his EMM Labs over to compare, EMM Labs was so much more resolving, coherent, everything an audiophile wanted.

is Win XP my limiting factor? I prefer iTune over EAC/Foobar just because I want to keep it simple (as much as I hate iTune). or am I asking too much from a modded Benchmark DAC USB to compete with EMM Lab? I won't go back to a CDP, I love the convenience of PC audio.