They have a free version too.
According to AV Comparatives, they (nProtect) use Bitdefender engine
Has anyone used it?
OK thanks, I'll also post the link to v5 on that threadI've used this and past versions. There is a thread about previous versions here.
nProtect Anti-Virus/Spyware 3.0 uses a dual engine (nProtect developed engine Tachyon + BitDefender engine) and a real-time component to protect your system various types of malware including viruses, trojans, spyware, worms, keyloggers and rootkits and other known threats to the user. nProtect...malwaretips.com
If found v4 to be too heavy at times for my liking. I can't remember if the current version was any better, but I prefer other free antiviruses.