Windows 10 was telling me "Critical error: Start Menu and Cortana aren't working" every few days, and the solutions recommended by Microsoft did nothing to fix it. After doing research elsewhere, I found that most tech forums seem to have reached a consensus that people with Avast tend to have the issue more than people without, so I uninstalled Avast 2 weeks ago and the issue has been gone ever since. So, has this issue been fixed yet? I can operate without antivirus, I have my web browser in Sandboxie, use Adblock Plus, and don't visit any shady sites, but it makes me really uncomfortable doing so because you never know if Windows 10 will develop vulnerabilities that sandboxing the web browser won't protect you from, like Windows XP had pre-SP1.