This question is posted a lot and YES you can have two vendors of virus protection. The only thing you have to do is set one as a real-time protection and the other as an on-demand protection. I personally use 3 vendors, why because I'm a tester. If you don't know what your doing then you might as well just use one.
This question has been posted previously. Please don't duplicate your posts. https://www.wilderssecurity.com/showthread.php?t=206270