There are many free anti virus software's are there in the market but all are free only for one month. You can use them all for one month as free and then you can renewal them for one year or more years based upon your package. Right now am using Avast which is good and helped my lappy from...
Check the following link this might be helpful to you....
http://bubblewitchsagaallhelpandactivities.blogspot.in/2012/10/how-to-remove-and-re-install-bubble.html