You do not need a standalone anti-malware, any free AV with a good detection will do, like 360 Essential.
But if you insist, go for Zemana, it is currently better than Malwarebytes anyway and it is really cheap.
AntiMalware - Buy Your AntiMalware - Zemana Store
No, you can get Malwarebyte Free immediately, just turn the trial off as soon as it's installed and running. In the setup for Malwarebytes 2 you had to opt in to the trial, if you didn't it installed as Free. You don't get an option in version 3's setup, the trial starts automatically, but once it's installed you can opt out.
If you go into 'MalwareBytes - Settings - My Account' you can turn off the 'premium trial'. It then becomes 'MalwareBytes Free' straight away,
@GregoryP: AdwCleaner does not offer realtime protection. It's a scanner to search for adware.
Found this on lifehacker.com: RansomFree by Cybereason Protection against ransomware. And it's free.
I found a problem with it. See RansomFree is the free program that protects your PC against ransomwar
I installed it 10 minutes ago and haven't run into a problem. Yet anyway.
You won't have a problem unless you have removable media.
Do you have a USB storage media?
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