Recently I had a bad Windows 10 computer crash. The PC totally locked up, and the only thing I could do was power it down and power it back up. The first thing I noticed was that my entire Windows Live Mail database was gone - not a single message of the thousands that should have been there was present. After much stress and work I was able to restore the messages, thanks to a Mozy backup that I had done the day before. The computer is now operating correctly when it comes to traditional programs like web browsers, Office programs, File Explorer, various utilities and accessories, etc. However, many of the newer Windows features are not working. Here's a list of some of them:Pressing the Windows key on the keyboard and clicking the Start button on the screen cause no response. Right clicking the Start button works normally.Right clicking an icon in the task bar does not bring up the expected menu. A small circle appears for a few seconds and all of the icons on the desktop flash briefly - that's all.The search box in the lower left corner of the screen does not operate - can't type anything in it.The icon spaces in the task bar for Edge and an alarm clock app I had installed previously are blank - no icon is visible. Clicking either of these icons does not start the corresponding programs.Attempting to install a Windows app (specifically Alarm Clock HD) gives no response when "Get the app" is clicked on the browser page.I have Googled these various symptoms extensively and have tried a number of suggested solutions. Here are some of them:From Microsoft Answers: With Task Manager, end process explorer.exe and then start it as a new process. Didn't help.Repair corrupt Windows files with System File Checker (sfc /scannow). Reported no errors.Reinstall Window apps using PowerShell and the Get-AppXPackage command. Didn't fix problem.Create a new user account. Clicking "Add a new user in PC settings" gets no response.A suggestion that I haven't tried yet is Refresh PC. It sounds quite drastic, and I've tried to avoid it if something else will work. Do I understand correctly that following a refresh I would need to reinstall all of my programs that aren't part of Windows? That might be quite a big job. Any suggestions would be appreciated!