I use bit defender total security 2013 for my windows 8 laptop , i just know that bit defender has launched antivirus for windows 8 , my question is , what is the different between BD total 2013 and BD windows 8 ? , what is the best for my windows 8 ? , i use BD total and it slow downs the startup and shutdown , i thinks i want to move to BD windows 8 , i need help from you guys , thank you .