I've used a lot of different antiviruses and currently use gdata with great results. But if you do not configure it properly it will slow things down a bit. If you do not turn of internet monitoring, it will scan absolutely everything your browser downloads, pictures, flash, and so on, every time you go to a web page. It will also effect boot time if you enable "scan system files at boot". I prefer to leave the monitor option to use only one of the engines for performance reasons, but have not had any problems with that configuration. It actually has two different options for email, so that you can scan either by port or everything, you only need one of these active, or again it will slow things down too much. Gdata also integrates into outlook so that you can right click a mail folder and scan it as well. The manual scan is slow, really slow. If you have a lot of data on your computer it will take a long time to scan. I have around 350 gigs of stuff and it takes around 20 hours to do a full scan, archives and all. You can make it run faster by selecting not to scan archives, but it is still slow. I have been very happy with gdata and have not had to reformat because of a virus since I have been using it. I have been thinking about trying Nod32 on one of my machines, because I too have heard good things about it. Nod32, Gdata and Avira's Antivir are the current top three antiviruses on the market today, rated by their ability to clean your system of viruses and their ability to keep the viruses off your computer in the first place. You can't go wrong with any of these. I have been happy with gdata, but it also the most expensive. No matter who you decide to go with, always make sure your buying it straight from the manufactures website. I know people who have had really bad things happen buying and downloading from third parties, especially antivir.
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Computer Security