how do I access the photos and videos from my computer that I backed up from my phone to verizon backup assistant plus?
You can download the PC (or mac) desktop application.
http://support.verizonwireless.com/clc/devices/knowledge_base.html?id=54607
or you can sign into My Verizon ( http://www.verizonwireless.com/myverizon ) then navigate to MyVerizon/Manage & Store media.
You can sign into your MyVerizon account through the computer and access the Backup Assistant Plus.