I'm still trying to get rid of some annoying virus that pops up in the bottom right corner of the internet browser on the family computer occasionally. The virus box is small and has ad links in it. It's white and orange with a logo on top that sorta looks like the skype logo

. The difference is that its green, doesn't have the s in the middle, and isn't filled in.
I've tried superantispyware, malwarebytes, microsoft security essentials, and multiple avast programs.
If one of you know what this is, tell me how to remove it and I will love you forever.
EDIT: On that same computer, I can't download files and open them instantly. After downloading them, it says that the file is blocked. I have to go to the properties and unblock it everytime I download something. It's really a hassle and itd be great if I knew how to fix that