In My long experience i have become susceptible to believe that if you are using net and also play games/ installs softwares regularly then antiviruses will ruin your os soon. A few of them definitely slows down pc and consumes your time while others will detect a virus or trojan in almost all softwares including the os itself. I just feel that ashampoo anti-malware is better to use than these anti-viruses because i got virus though kaspersky was on. This is a peculiar virus which says your system is infected and needs to be scanned!!! Actually it alters the security option in control panel in am automated /autoforced access to system control.