How to stop the theftaware and sms to two reciepents?

I have nokia E72 and I dont remember when did i installed this software. It is not even visible in my cell but still two of the phones are receiving countless sms giving them my GPS location. How do i stop this?

https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1034