tap0901.sys is in \system32\ folder AND driver is still registered in registry – could be checked by various applications e.g. Autoruns, serviwin (NirSoft).
Open Windows Device Manager, choose View and then check “Show hidden devices”. Then click on the “+” mark next to “Non-plug and Play Drivers”. Do you see the driver there?
Any chance uninstallation of driver would be done by TC installer itself without necessity to read rather long instruction (link you provided) and necessity to use 3rd party tools?