i got my macbook about 2 years ago when my mum bought it for me for christmas. My mum, being a completle idiot when it comes to computers, did not realise that it doesnt have windows on or that i did not have a clue how to use a mac. So i immediatly asked my dad computer genius friend to change the operating system to windows xp. This means that when i turn the computer on there is NOT an option to go on either mac or windows it is JUST windows. Two years later a really regret my decision and was wondering if i somehow found out how to remove windows would my mac operating system still be there or would i have to re install it completly?