Hi! PLEASE HELP

MY OLD LAPTOP CAUGHT A VIRUS THAT ERASED THE ENTIRE HARD DRIVE. NOTHING COULD BE RECOVERED. I JUST BOUGHT A NEW DESK TOP WITH WINDOWS 7 AND IM WONDERING HOW I CAN SYNC AND BACK UP, MAYBE EVEN TRANSFER MY ENTIRE ITUNES LIBRARY THATS ON MY PHONE TO THE DESKTOP. INCLUDING PICTURES, RINGTONES, MUSIC (PURCHASED AND IMPORTED), APPS, CONTACTS, ETC. ANY INFORMATION WOULD BE VERY HELPFUL. THANKS A BUNCH