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#11
It should be - windows defender has come a long way in it's later versions, and as long as Malwarebytes is working for you, (Version 3 can be a little troublesome), and they are fully updated - together they should be enough,
This is in addition, of course to good internet practice, especially relating to Offers you see for Free Templates, and other word add-ons, that are most likely to contain malware - also you need to be careful sharing any files with anyone you do not know and trust
Another good practice is if you download anything from the internet or from an email from any source - Right click on the file and run a specific scan on the file with either Defender or Malwarebytes or preferably both