Crumbly, non anti-aliased text in Windows XP

At home the computer of choice is my old white intel Apple iMac which so far has served me well and take for granted the nice, smooth, anti-aliased text it produces on screen. I had a bit of a shock when i started first day at new job (a while back) and got seated in front of an old PC powered by Windows XP. I loaded up the latest version of Firefox browser and looked in horror at the jagged, crumbly non anti-aliased web text some of which was almost unreadable.