http://avs.nprotect.com/global/ Yesterday, I posted about version 3.0 of AVS which costs $30 a year. Just now after doing some more searching I came across v4.0S which is completely free. It uses Bitdefender's scan engine along with its own. However, it would seem based on my initial observation that it only receives Bitdefender definition updates once a day. Currently is v7.59218 definitions, whereas Bitdefender is up to 7.59228. However, last night Bitdefender was only 1 version ahead. Compared with v3, it has a completely different user interface and the firewall has been removed. While v3 was very light, v4 is heavier. I'm doing an initial basic scan, and CPU use is reaching up to 86%, with it usually being over 70% (bearing mind my laptop has got an ancient CPU) which is a lot more than for the previous version. The scan is still underway, so I do not know yet it has any caching to speed up inital scans and make it lighter. However, the previous version did not. I have yet to test impact on system performance when its not running a scan. Like the previous version, you can set it to not automaitcally quarantine threats. Ignoring threats is easier in this version as it gives you the option to ignore a threat upon detection. It appears to have some sort of proactive protection, as it was alerting me whenever Kerish Doctor access my hosts file - which I was able to ignore to avoid further alerts. But, there are no proactive protection settings. My inital thoughts on this are that is too heavy for my liking, but I will do some more testing and post the results here. It would fare better with a newer, more powerful CPU.