Can I use both AVAST and Norton?
No...
Hi, PJ...I have no idea, but I have never heard anything good about Norton.
On problem may be in getting rid of Norton if you want to.
I have heard it invades every every area of your computer, but I am not an expert on the matter.
I defer to many wiser Freepers.
Oh, I also use FREE SpyBot...It is quite good.