Twitter has ads now and will redirect to another website?

My daughter was playing some games that we installed on Google Chrome, and one of them is called Stardoll. Now I was looking for cheats to get some more of the "money" needed to buy items on Stardoll, and I think I downloaded something very unsafe. I uninstalled everything, but now there is an ad below two tweets on Twitter and above the info where it states my tweet count, followers, and following (next to everyone else's tweets). Then after a while Twitter redirects to thehottesttube.com or maybe yourhottesttube.com. Whichever the name, McAfee has not located the virus and I want to know what could have been the cause/how I can fix it ASAP! This is a new laptop!