One year for 3 PC's. I like the added protection of Malwarebytes and caught some nasty Malware on my PC's. I also have Norton Internet Security and Malwarebytes finally got rid of a few virus that Norton could not. Norton detected them, but could not permanently get rid of them like Malwarebytes did. Works smoothly with Norton. So, thanks Malwarebytes.

This product had installation issues. I'm very computer savvy. Googling came up with some things to try, some of these things really weird. In the end, installation attempts were a complete failure.

Finally, I just downloaded free trial version from MalwareBytes.com directly. Then immediately 'activate'd the license with the key card provided. Worked fine - when installing this way. So, big question is - why even supply direct media - if that's not even going to work? Might as well just sell the License Key / License ID.

I give 5 stars for the efficiency of this product because it found 155 threats and malware on my computer on its very first scan, threats that multiple antivirus programs could not detect. Previously, my computer was running extremely slow, and I was getting hijacked to various annoying webpages. Now my computer is running fast and back to normal!
I did take 1 star away because I bought the Premium Edition, but when I installed the program from the CD, it said that it was the free version, and I needed to upgrade to Premium.
Still, this product works. Recommended!

Worked very well to rid my laptop of some pretty persistent malware that came from the old site of a company now out of business.
Couldn't load from the disk they sent, but easy to download from Malwarebytes web site.

So this one was a bit round-about. But I got it to work (I'm using Windows 10). I originally had free version of Malwarebytes installed on computer. Tried installing this CD with free version still on there, but didn't seem to work. So uninstalled the free version, then reinstalled this one, using identifier/key/ that came with it. It updated to latest version automatically, which was cool. However, the Malwarebytes dashboard said I only had less than one hour left of my subscription. It's now the next day and it's still saying that, but I've still got full protection and full use of the program. When I go to the View Details for the License (on the dashboard) it says license Duration is "Unknown". At this point, since I've still got full protection, I'm going to take that to mean I'm covered, especially since it's still providing full protection. So, at the end of the day, I've got full coverage...no complaints. I'll update if anything changes.

UPDATE 7/9/16: The "Less than one hour..." warning went away, and now reads "...fully protected". The View Details tab says I've got 365 days left, so all seems to be good there. It has already caught some malware, so it is working.