Computer problem!?

So we decided to like refresh the laptop i dont really know the exact word for it but like the laptop got everything erased from its memory and is like if you just bought it cause we were haveing a lot of prob. w/ it so ever since then whenever I scroll down it will like ripple or wave.. i dont really know how to explain it but it is soooo annoying! and also it is like the screen image has enlarged it is so BIG like the mouse is humungo and we cant change it on our settings..Does anybody know what i am talking about and knows how to fix it... or just tips?! anything would help! thankyou!