I have extensivley tested symantec corporate edition at work as I use it on 500+ pc's, and I get on average about a 25% slowdown in system speed with it installed and auto protect turned on. Its a truely aweful piece of software.
I've been using NOD32 as my anti-virus for the past two years, its inexpensive and very resource friendly. No infections and its received many awards.
avast for my anti virus
avast only has pop ups when it updates the database or when it finds a virus but you may be able to turn those off.
I have extensivley tested symantec corporate edition at work as I use it on 500+ pc's, and I get on average about a 25% slowdown in system speed with it installed and auto protect turned on. Its a truely aweful piece of software.
Cant say Ive ever had a problem, its probably the best one Ive seen and its not bloated like other bits of antivirus software. What version were you running?