I have run adn will continue to run Kaspersky anti-virus on my main laptop as it is one of the best performing and secure systems I have used so everything I try is rated against Kaspersky. Bullguard is as good. As I have over 7 PC's in the house I often find myself needing more anti-virus software and Bullguard fits the bill perfectly, especially as this version is licensed for 3 machines. I installed onto Win 7 and that went without a glitch, the updates are regular and without hassle adn the software isn't slowing anything down. I recently found a stack of DVD's with old backups on them Bullguard popped up a couple of times to warn me of viruses inside old ZIP files and did a good job of stopping me caopying anythin naughty onto my computer. As for surfing well that hasn't slowed down with Bullguard running so all in all 5 stars from me.