I've been hearing so many people slam Norton Antivirus, that I decided to do a careful comparison between Norton and AVG, one of the more popular antivirus programs. I have 163gb of data spanned across 3 hard drives. I have a 4th hard drive, but it only has movies on it and both applications took less than 10 seconds to scan the drive. In the end, AVG took 10 minutes longer to scan the 4 drives. It took twice as much memory to do so. And the cpu usage was somewhere around 10% - 20% more than Norton used. Neither of the two found any viruses on my machine. Norton scan time - 14:19 Resources - Pinned at around 19.5 mb for entire scan Cpu usage - 5% - 51% Overview - Cpu usage was mostly in the 20%-38% range, with anything over 40% only lasting a second or two. AVG - 24:20 Resources - 36mb - 49mb Cpu Usage - 6% - 59% Overview - Cpu usage was much worse than Norton. Long stretches of the long scan were in the 40% - 53% range. Edit* I also did a check on which program uses the most memory during normal non-scan usage. AVG used 38mb, while Norton only used 25mb. .