Internet Explorer keeps on opening non-stop

[Melonator]

Whenever I try to play a game (League of Legends), Internet Explorer suddenly opens.
It's not just one page of it, it's a lot of them. They keep on opening non-stop.
What's more is that my Google Chrome opens as well, and an ad page appears.

It happens every single time I play. I think that something's wrong here.

Any ideas on how to stop this?

 

[Tradesman1]

Run a virus and a malware check.