iolo System Shield 4 is an antivirus tool that's designed to offer the maximum amount of protection, with the minimum of impact on your performance and productivity.
Once installed, the program will immediately protect you against viruses, spyware, bots, keyloggers, adware and more - over 2.1 million threats, in total. You're covered in real-time, with the program blocking dangerous programs before they can launch, and scanning and disinfecting both incoming and outgoing messages. And a scheduler will automatically run additional scans to catch any additional threats that may have reached your hard drive.
System Shield also includes "Sentient Technology", iolo's own heuristics engine that checks running processes for suspicious behaviour, allowing it to detect even brand new malware that hasn't made it into the virus definitions database yet.
There's plenty of protection on offer, then, yet it's delivered with minimal impact on your system. Lightweight design means there's little affect on your PCs performance, it won't interrupt games or videos with annoying pop-ups, and even scheduled scans can be tweaked for your convenience. By default they won't start until the system has been idle for at least 20 minutes, for instance, so System Shield won't suddenly pop up and interfere with your work.