Should I uninstall Norton?

It was my grandma who installed it. I heard it really slows down your computer. I can't even play Slender without lagging! I want to install it and get a new Anti Virus, but we still have 244 days left of it! I don't want to waste my Grandma's money. It was just renewed. Also please suggest good... show more It was my grandma who installed it. I heard it really slows down your computer. I can't even play Slender without lagging! I want to install it and get a new Anti Virus, but we still have 244 days left of it! I don't want to waste my Grandma's money. It was just renewed.

Also please suggest good Anti Virus programs that I should get.
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