Click on the 3 horizontal lines in the top left > Options > UI Settings tab. Here you can change the fonts that are used for the texts. (Records font, Messages fonts and Viewer font)
You're looking at either the official Creation Kit: https://store.steampowered.com/app/1946160/Fallout_4_Creation_Kit/
Or, Fo4Edit: https://www.nexusmods.com/fallout4/mods/2737/
VectorPlexus isn't a dangerous site at all. This is just Norton being overprotective.
Is there some way to temporarily disable that "Nortons safe web search" stuff? If so, I'd do that, then try again.