Hello and welcome to Eightforums, if it was a system restore back a few days or weeks ,then try another restore back to the day he did the restore .
what are the exact message of the errors
you could try disabling the antivirus as suggest in the error box ,a system restore should not affect emails, you could reinstall the apps that don't work properly
Hello lolcocks, and welcome to Eight Forums.
If this is happening with modern apps, then you might also see if the listed troubleshooting items in the tutorial below may be able to help.
http://www.eightforums.com/tutorials/21051-apps-tiles-not-working-responding-fix-windows-8-a.html