Unauthorized Charges

Hello, I woke up this morning to see a notification from my bank saying I had been charged 44,99€ by DRI*AVG Technologies. I would really like to know the reason for this, since I’ve never authorized this to happen. And if the reason is this so called “automatic renewal” that I was never notified of, I would like to know if I can request a refund for this payment I did not authorize. And it seems I’m not the only one having this problem either.