I have a windows 8 pc and my calendar is annoyingly showing American holidays (thanksgiving etc) how do I change this to a UK version. I am just getting used to Windows 8 after finally ditching my old windows 2000 pc, I also use Vista at work but I can't work out how to change my calendar on this windows 8 pc.

Please can someone explain simply to me how I can do this.

I'll be sooooooooooo grateful.