Simply try deleting your history.
If that doesnt work 'Google' always solves my PC issues. There is only so much a site full of Naruto fans can do when it comes to tech issues lol. I might be able to help you another way however. Ill VM you.
If your account was hacked then these things would happen. Your password would change, he would post stuff.....etc... That or it has something to do with you using a Ipad dude....
It doesn't seem like your account is hacked but rather that you have some kind of malware or other infections software on your computer, probably caught while surfing unprotected.