I got a new PC laptop and installed iTunes and iCloud Panel?

Everything syncs over from my iPhone but not my Calendars!

Make sure on your iPhone that the Calendars are on (setting>iCloud>calendars). If it is on go into iTunes go into your iPhone and under the tab "info" it should have a place that says "Sync calendars" that is where you can make all of your desired changes. If it still does not fix get in contact with Apple.