I would recommend to reach out to the Palo Alto Endpoint support and asking for the TrapsCleaner tool for that Traps version. This Tool deletes the whole Traps installation also if you are not able to delete it from control panel.
Would you be able to execute Traps msi installers from command line? Executing Traps installer from the command line allows you to generate a log file. This log file will record why the uninstall is failing.
CMD.exe -> msiexec /x path/to/traps.msi /l*v c:/Trapsinstaller.log
You could also look into Event viewer -> Application. You might get some more information there.
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