I just upgraded a Windows 7 machine to the latest version of Windows 10. The one pre-existing user account, Administrator (my clients aren't terribly creative :)), is missing task bar icons for all the Windows 10-related apps (e.g., Windows Store, Edge, Mail). There are blank spaces in the taskbar where those icons are supposed to be.

In addition, the icons for File Explorer, Google Chrome and Firefox -- the only icons that were present in the Windows 7 taskbar -- are "old style". Meaning they don't look like the Windows 10 icons. I checked this by creating a new administrative user account -- its icons are the correct, Windows 10 style ones.

I've run sfc, and some other Microsoft-supplied command line repair app whose name I don't recall. Both found and fixed problems, but the icon problem still persists.

I've tried clearing the icon and thumbnail cache files from C:\Users\Administrator\AppData\Local\Microsoft\Windows\Explorer. That didn't work.

I also tried copying the "correct" files from the corresponding Explorer folder for that new administrator account I mentioned, and that didn't work, either.

Interestingly, after deleting the cache files and copying over the new ones, and restarting Windows, the contents of the Administrator cache folder are the old/pre-existing/wrong files. So they're apparently being restored from some place that I don't know about.

One final observation (for now): the files in the Administrator and new test account don't match: the file sizes are not the same.

How do I go about correcting this problem?

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