It happened to me. It took an IT professional 2 weeks to get it back up and running. Getting it back today (I hope). I had windows 7 and it just crashes one morning. Windows 10 upgrade done overnight was the cause.
Unless the root cause is fixed it will happen again.
Windows Update set to Automatically download and install... + “Give me recommended updates the same way I receive important updates” checked will result in an auto update to Windows 10. The second will re-appear checked if it’s unchecked. It’s best to prompt for download and prompt for install. Or disable Windows Update service.
Find another IT “professional”
Yikes, your tech isn’t very good. Took me 10 minutes to revert to 7 from 10 on a client’s computer about a week ago.