It always amuses me when people recommend an AV program simply because they've had no problems with it. The only time you'll find a product's worth in the case of AV software is when you actually get a problem.
And how a product looks is worthless imo, that's just a candy coating on the engine, so to speak.
When choosing an AV program only two things will influence me - independent extensive testing of multi products by people who have exposed each program to a series of nasties and my own testing of each product.
I've mentioned this before but a couple of years ago I installed Win XP Pro with all updates via Acronis True Image onto a removable hard disk and tried three free AV programs - Antivir, Avast and AVG. I then answered iffy e-mails and opened their attachments and browsed some seriously dodgy websites until my OS became infected.
AVG and Avast quickly fell at the third hurdle or so whereas Antvir lasted some considerable time before falling foul and did stop and remove those which the other two had missed.
So at the time I went with Antivir and I have it running in Win XP, Win Vista and Win 7. The update popup is extremely annoying I must admit, especially if I'm in the middle of an online game of Call Of Duty as the Antvir update sometimes causes it to crash to the task bar. There are ways to disable the popup but no sooner than a solution is found, it seems, Antivir change their product via an update to overcome the block.
I have read of Antivir throwing up false positives but it's rarely happened to me.
However, my own testing was two years ago which in the world of anti virus software is a lifetime. Things change, the competition between AV software compilers is intense and the usefulness of each product will vary on an almost weekly basis.
So it's time to reconsider methinks. I'm open to trying anything as long as it's free, I don't see the point in paying for software when a free product can do the same job. AV software suppliers give away free lite editions of their software as it's a good way of receiving user feedback and that enables them to hopefully keep ahead of the viruses in the wild and thus stay competitive enough to sell full editions of their program.
That's the reasoning behind free AV software, none of the suppliers are that charitable to actually give away a product where they have to pay employees wages to keep their product updated.
MSE is a new one on me, is it free? I shall enquire.
I may try several AV programs again with another test if I can muster up the enthusiasm.
In the last two years on all three Windows' OS's Antivir has caught and cured a few minor nasties, as have Superantispyware and Malwarebytes, but nothing serious as far as I could tell.
I wouldn't recommend any AV software until I'd seen it actually do it's job which I think is the best criteria for reccomendation.
My shiny shilling's worth, as it were