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System Font Change not applying properly


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I have two Ethernet networked HP laptops running side by side, both of which were upgraded simultaneously to 20H2 with all updates via in-place installs from an ISO created with the Media Creation Tool, copied to both desktops, then mounted and used to do the upgrade. After that was finished, which was accomplished without any problems, I the used the same registry script on both machines to change my system font. Here is the script, which I merged into the registry on both machines:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts]
"Segoe UI (TrueType)"=""
"Segoe UI Bold (TrueType)"=""
"Segoe UI Bold Italic (TrueType)"=""
"Segoe UI Italic (TrueType)"=""
"Segoe UI Light (TrueType)"=""
"Segoe UI Semibold (TrueType)"=""
"Segoe UI Symbol (TrueType)"=""

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontSubstitutes]

"Segoe UI"="Comic Sans MS"

I know the script is good, because on one machine my changed font is working properly everywhere (this machine has other problems after the install which I have asked for help on in another post. On the second machine however, the font substitution doesn't work properly (it worked fine before the upgrade). It changes the font on the desktop OK, but does not change the font in File Explorer. Moreover, I am running the Microsoft Newsbar on both machines, and the one with the font substitution problem changes the font back to Segoe UI as soon as I minimize the Newsbar. If I redo the merge, and either restart or shut down and reboot, the font on the desktop (but not in File Explorer) changes back to Comic Sans and if I minimize the Newsbar the problem reoccurs. I have looked at the Registry Key for FontSubstitutes on both, and both appear correct and identical.

Does anyone have any ideas as to why this happens on one machine only, or suggestions for a fix? This machine doesn't have any of the problems that the other machine suffers from, namely some Gadgets that worked fine before the upgrade won't work now (even though they still work fine on the machine with the font problem) and the notification area collapsing as soon as I attempt to look at a notification- I have set my Show Notifications for to five minutes).

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To change the system font on Windows 10, use these steps:

  • Open Settings.
  • Click on Personalization.
  • Click on Fonts.
  • Click on the font family that you want to use. For example, Arial, Courier New, Verdana, Tahoma, etc.
  • Open Start.
  • Search for Notepad 
  • Replace the ENTER-NEW-FONT-NAME placeholder with the name of the font family exactly as it appears in the title of the settings page. For example, Courier New.Font family settings on Windows 10
  • Click the Save As option.
  • Under the "Save as type" option, select the All Files option, and name your file anything you want with the .reg extension. For example, change-windows-10-font.reg.Change System Font registry file on Windows 10
  • Right-click the ".reg" file and select the Merge option.
  • Click the Yes button.
  • Click the OK button.
  • Restart your device.

Hope this helps 


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Thanks, but that's not the problem. I used the exact same reg file on both machines, both before and after my in-place upgrade. It worked fine on both laptops before the upgrade, and worked perfectly on one laptop after the upgrade but not on the other. The problem has to be something else.

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