A lot of folks use the FREE AVG,
I prefer Kaspersky or Trend Micro.
Hate to say I agree with the ASS boy but in this case he is correct, Symantec and McAfee are both worthless and hog too many resources.
Oh and BTW I've been in I.T. since 1973, I was a Data Systems tech in the Navy in the early 70s and have worked in the IT/Telecom industry ever since.
I was on the Internet before it WAS the internet. Arpanet and the unix command line.....
Danny