Firefox does not open after I downloaded Microsoft antivirus, why? How to fix it?

Firefox worked fine on my desktop for years but when I downloaded Microsoft antivirus two days ago, Firefox does not work. It will not open anymore.

Thanks LN.
Now that I got an expert's attention, there are two problems that bug me all the time and have not able to get an explanation/solution:
1. After restart, the trackpad lost it's ability to tab and click. I always have to use the mouse to tap the user (myself) to get the tiny signin password window. After that, all trackpad functions work fine. This happens for me through Marverik and now Yosemite.
2. This one only happens recently after Yosemite upgrade. Everytime after restart, I have to reset my Verizon Router manually in order to establish network connection to access internet sites.
Thank you for your help,
...Jeff

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