Norton 360 Antivirus and Firewall is great at default settings. Protects as advertised. Found my PC slowed down over time due to spyware and adware being laid all over the place. CNET.COM downloads free spyware removal tool I used that works. SUPERantiSPYWARE..... Doubled my speed to a condition that I haven't seen since my PC was new and didn't have thousands of downloads. Run full scans once a week and follow up with Disk defragmenter and register cleaning.