Hello John,
Files being lost after an update may be caused by you're signed in with a temporary profile or the files are moved to Windows.old folder. We recommend that you follow the methods below to retrieve your files:
Method 1: See if you're signed in with a temporary profile
- Go to Settings then Accounts.
- Click Sync your settings on the left pane.
- Check if you see a message at the top that states You are logged on with a temporary profile. Roaming options are currently unavailable, if yes; Restart your computer then sign in again.
Note: We can't sign into your account. This problem can often be fixed by signing out of your account and then signing back in. can also be address by restarting your PC and signing in again.
You should back up everything you worked on since upgrading to an external drive, or it'll be deleted when you sign out of the temporary account.
Method 2:
Select the search box on the taskbar and search for your files. If you don’t see them and you’re not signed in with a temporary profile, use the troubleshooter to fix problems with Search. In the search box on the taskbar, type indexing, and then select Indexing Options. Select the Advanced Administrator icon button to view more options, then select the Troubleshoot search and indexing link and follow the steps.
More things to try:
- Some files might be hidden from view. In the search box, enter Show hidden files and folders. Under Hidden files and folders, select Show hidden files, folders, and drives. Then try searching for your files again.
- Look for all files of a certain type using the asterisk (*). For example, to search for all Word documents, search for *.doc. For music files, search for *.mp3.
- When you upgraded to Windows 10, some of your files may have been moved. To check the location of files you find, press and hold (or right-click) the file and select Open file location. Copy any files you want to move to a different location.
Method 3: Search for Windows.old folder
Click this link on how to retrieve file from the Windows.old folder. The article is also applicable for Windows 10.
If you think this was useful, feel free to "mark it as an answer" to help those who are facing the same problem.
Let us know if the methods above worked.