(Just seen your Edit about a new install the way to go is :- )
It is usually not necessary to re-install Gimp. A problem is most often in your Gimp profile.
The procedure is.
If you have an old Gimp 2.8 profile C:\Users\"yourname"\.gimp-2.8 move it some where safe (or delete if not needed )
Rename the existing Gimp 2.10 profile to disable it.
C:\Users\"yourname"\AppData\Roaming\GIMP to C:\Users\"yourname"\AppData\Roaming\GIMP-old
Start Gimp and it makes a new default Gimp profile.
Download resynth.zip https://www.gimp-forum.net/attachment.php?aid=2609
Unzip and put the 4 files in C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins
If that does not work and a re-install is needed Use the Gimp uninstaller first and delete any Gimp files that might be left over. Disable any existing Gimp 2.8 and Gimp 2.10 profiles.
It is usually not necessary to re-install Gimp. A problem is most often in your Gimp profile.
The procedure is.
If you have an old Gimp 2.8 profile C:\Users\"yourname"\.gimp-2.8 move it some where safe (or delete if not needed )
Rename the existing Gimp 2.10 profile to disable it.
C:\Users\"yourname"\AppData\Roaming\GIMP to C:\Users\"yourname"\AppData\Roaming\GIMP-old
Start Gimp and it makes a new default Gimp profile.
Download resynth.zip https://www.gimp-forum.net/attachment.php?aid=2609
Unzip and put the 4 files in C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins
If that does not work and a re-install is needed Use the Gimp uninstaller first and delete any Gimp files that might be left over. Disable any existing Gimp 2.8 and Gimp 2.10 profiles.