when I am chatting on facebook, ads are popping up over the chat dialogue, making it impossible to read.?

[Karen]

the ads, are transparent so I can read a few words of my chat, but the ad pictures are solid, so a lot of the conversation is hidden, it's so annoying, could this be a virus on my laptop, how do I get rid of it, please help, thank you. kazaraz

[Lauren]

that is called spam and spyware make sure ur advast is turned on or ur adware and if u dont have it get it!!! they are both free and they both work really good and if u dont have anything protecting ur computer u will get a virus maybe like a million adware and advast stop ads like that from popping up and it also protects other stuff from being able to download with out ur permission