Is MS Security Essentials good enough?

Seems to work good for this desktop I'm on right now.

I do a deep scans at 4am everyday.
Plus its free.

Also if you do go to MSE make sure to remove the others, to many AV's makes a PC go crazy.

I've been using MSE for about a month now and I like it. Then again I haven't had a virus in 6 or 7 years and before using this product didn't even have any antivirus installed for 3-4 years. So I can't really say on how well it protects. But I do know this, anytime I've seen an older computer of someones running super slow with Norton installed, uninstalling Norton speeds it up exponentially. Norton is a major resource hog, there are plenty of free suites that do just as good job and don't take as much resources to run. I recommend against Norton.

No AV is good as using common sense. That said, MSE is a solid product with low system resource usage (surely lower than Symantec AVs). I like it. If you don't go crazy downloading everything in sight, any decent AV product is going to work.

So yes, it IS good enough.

Its free
Its by Microsoft

I'd say so.