Microsoft does NOT use ETrust on their computers...
When I went to the Microsoft Vista launch for IT professionals, the professional speaker had ETrust Antivirus on his demo computer.
Someone I know was talking about antivirus reviews and we did some research. Bitdefender got the best antivirus of 2006 on at least 2 well-known websites. I use NOD32 though. It's good. ![Smiley :)](https://www.computerhope.com/forum/Smileys/classic/smiley.gif)
On my Vista RC-1 hard copy there were free trials of eTrust and IIRC, Bitdefender.
So I suppose one could say, eTrust was an early Vista partner.
On this machine, I have AVG, AVG-AS (Ewido) and Sygate .
Spybot, SpywareGuard and SpywareBlaster are also in the mix.
Sygate hasn't been supported for some time now, as it was purchased by Symantec.
I like Sygate but I will move to Kerio or Comodo when the time comes.
One little gadget that I've bee playing with is McAfee SiteAdvisor.
It's a tiny, free utility that reports on the relative safety of various websites as you browse.
It has its detractors, but I've been finding it useful and very light.
The group above have been keeping me safe for a long time and the whole package is surprisingly light.
IMHO, it really boils down to what you do and how careful you go about it.