Thanks for sharing your experience with us that might work for other users too.
However the XP style option is there for a reason, if affects something and it has a function.
Did you check the "my music" section just in case? unabling that option makes now all the albums HUGE and iTunes menus blurry also many other third party Windows programs may be affected by that change, i have a longman dictionary software and the interface became big and blurry by doing that.
Problem is not our machines but Apple stupid changes, Apple is the one messing and changing stuff here not us, personally i don't think they are gonna fix.
Personally too i have noticed that the iTunes for Windows fonts have become uglier and uglier each version, more blurry, less clear, i mean the Apple guys have changed it over the years but not for good and now is worst than ever sadly.