i have someone who is wanting to hack my computer to view all of my typing, chat and media history, if possible how would i be able to delete this history or is it even possible for someone to view that kind of history?

The only way someone could do that is if they installed some keylogging program on your computer. If a parent or boss, they have every right to do so. If a badguy, you need to secure your computer.

Have you scanned for malware? How do you know they are watching?