Just read this and understand it. Act fast so you'll not lose anything (assuming he is watching you here on BHW).
If the so called "Hacker" is typing in your notepad and controlling stuff, they you'll have to reformat your HDD.
This person isn't a hacker, it's a scriptkiddie, so don't be afraid, just act fast. Don't forget to backup your important files on a usb stick or on a cloud service.
After you reinstalled Windows (I would suggest using Ubuntu, you don't get so easily infected with Ubuntu, most RATs are meant for Windows PC's), install BitDefender Total Security 2015, here is a link:
Code:
http://sharewareonsale.com/s/bitdefender-total-security-giveaway-sale
Price: FREE. Just give your email and get the download links, and follow the instruction in your email you will receiving after you submit your email.
Install
HitmanPro:
Code:
http://www.surfright.nl/en/downloads/
Also install
MalwareBytes. (Recommended)
Best recommendation I can give you at the moment.
Do remember, be sure not do download cracks, serial codes, keygens, warez software.