Slows your computer down from and estimated 1/3 to 1/5 speed. Though not as bad as McAfee, I still wouldn\'t have the product on my PC if you gave it to me. A staunch believer in Norton and a bit of a paranoid on how often he updates and scans one of his many computers, did so before bringing his Norton protected PC to our shop a few years ago, and proudly indicated the problem he had was not a virus. AVG found 60 worms on his PC that Norton missed. In the industry, a virus is technically not a worm, but a bad thing was still there and a virus by any other name, is but a virus.