[svandamme]

for the record, Windows Defender is NOT an antivirus tool, it's an anti spyware / adware tool

you still need a proper AV scanner to work alongside Defender...

dunno why everybody is bashing Symantec, i've had it for 5 years(enterprise version, but the scanning engine and dat's are identical to the regular version , it's just the interface and managability that are different...), i download a lot of crap, i will go on sites that are virus heavy, and have never had a single infection on either on my pc's, nor does it slow down to a crawl...

all this my AV is better then your AV is basically a load of bollocks in my opinion, just make sure you always have AV right after installing the PC, before connecting it to the (inter)network, and make sure you have daily checks for updates scheduled from the get go...and the leading brands , be that symantec, or Mcafee are no worse then the little brands like Trend AV, Kapersky and whatever else there is out there...

most problems with AV scanners not working, are basically user problems... misconfigurations ( disabling realtime scanning), not updating the dat's, turning it off, not verifying if it actually is running