I've been thinking about adding Prevx to my current security setup which is also KIS 2010/2011. What I do like about Prevx is the Safe Online and Rootkit detection features. I do have some questions though. Will running both KIS and Prevx cause my internet browsing and PC to slow down? Will I be able to upgrade to Prevx 4 when release for free? If I decide to buy it. Should I download the Safe Online version (Facebook) or the one from the Prevx website to purchase? Is there a difference? Thanks.