I think you are wrong! Have you ever used norton in a P4 pc which has not a good configuration!
If not then check it that after installing norton are u able to do some work in that pc!
I think NORTON is most bad, I can tell u some viruses which are not detected by norton "lax.exe","avg,vbs" etc.
And kaspersky is so difficult to use and for me it has never crashed a pc even it is a P3!
nortan is bad i agree, kaspersky is confusing, but its good. I have been using it... It blocked things even from the sites on its own...
See, this all is depends on someone personal choice and you can't force them. You like Kaspersky, which is as said....confusing. I have used Norton in P4 too, and all I can say is, it's working fine till now. and Yes, I am still able to do my work, even I can run VS.NET in my system.
The disadvantage is only that it's decreases the speed of start-up, and if it have slow down your PC then change the configuration.
The viruses not detected by norton like "lax.exe","avg,vbs" etc. then I can say No One Is Perfect. May you could have report this to Norton.
In Kaspersky, I found much difficulties, if I tell you, after installing it, it got crash my pc, I had to format my PC, that's why I don't like Kaspersky.
Depends on person to person.