Where is these popup ads coming from on my KitKat 4.4.2 tablet?

[AC Question]

When ever I play solitaire an ad pops up between hands and when I open new tabs. on chrome. I haven't had this problem before and deleting the solitaire app didn't help, These ads ask if I want to download apps, buy products, etc. I've had this Azpen A909B tablet for just a year now and haven't had this problem before. I've scanned for virus but nothing works. I hope you can help.