I have had minor issues with NAV 2002 on XP pro. Though nothing to get concerned about. I uninstalled it and all those issues went away. I installed my old version on NAV 2000 and had no such problems. Though I not recommend going long term without some virus protection, they are all going to have pitfalls, most are either less likely to catch the virus in the first place or cannot fully containd or delete it, some will signaificantly slow down your machine, and the rest will have some issues at some point that will cause you to hate them. I have 6 machines here and a consulting business where I tell my clients the same thing. I usually recommend NAV (norton) to my customers, but I have seen most of the AV products out there, and can say that none are perfect and all cause problems. Most of my machines here use NAV either 2000 or 2002, one uses Trend PC-cillin, one uses something called Panda, all in all they are all virus free. I have run those tests that Symantec used to use on all my systems and all the AV scanners found them all, execpt for an old copy of McCafee. Use one that does not impact performance unless you really need the best protection, since most virii need you to be somewhat stupid to begin with, if you just don't open any and all email attachments unless you know they are clean, you stay away from MS outlook, and you don't download and run unknown programs you should not need the protection NAV offers. You could then use one of the lesser known ones, the ones that have more to gain by being less vigilant and less obstuctive. That is just my 2 cents. You of course may have different opinions, and therefore should just do what those opinions lead you to do, unless they tell you to use McCafee, since I think we all agree that they are not so good.