Big, ugly, facebook ads and miscellaneous spam?

[Kevin G]

Just starting today these big flashy ads have started popping up on my facebook. They're extremely annoying and I don't know why they are there or how to get rid of them. I've also noticed a new option for emoticons in my chat box that I do not think is a regular thing, and also on wikipedia a few words are highlighted blue like they link to other wikipedia pages, but when hovered over ads related to the highlighted word pop up. I feel like I probably downloaded one of those annoying spammy plugins along with some freeware I recently downloaded from Cnet, but I don't what it is or how to remove it. Any help would be greatly appreciated