My wife's computer (Windows 10 & webroot) does not allow most sites to load.

Hello RichArms50,
 
Welcome to the Webroot Community,
 
Would you try a uninstall/clean reinstall of Webroot to see if Webroot is the issue? Before reformatting? It wouldn't hurt to do a clean reinstall of Windows/Webroot if you feel ithis will fix all her issues.
 
May I ask if you have cleared her browser History and cookies as well? It may be something as easy as that. You could use CCleaner from the website Piriform.
 
Please follow the steps closely!
 

• Make sure you have a copy of your 20 Character Alphanumeric Keycode! Example: SA69-AAAA-A783-DE78-XXXX
• KEEP the computer online for Uninstall and Reinstall to make sure it works correctly
• Download a Copy Here (Best Buy Subscription PC users click HERE) Let us know if it is the Mac version you need.
• Uninstall WSA and Reboot
• Install with the new installer, enter your Keycode and don't import any settings if asked to as you can set it up as you like once it's done
• Let it finish it's install scan
• Reboot once again

Please let us know if that resolves your issue? You could also Submit a Support Ticket free of charge and they can also look into this for you to see if Webroot is blocking her sites.
 
Thanks,