Tbh, in my experience the default uninstaller worked better than the dedicated one. The dedicated one left some crucial things behind that the default one didn't. For example the dedicated uninstaller didn't remove some registry entries from Winodows Security integration. Let some more registry entries intact, didn't remove one driver and didn't remove Bitdefender's certificate from Windows certificate store that is used to scan HTTPS connections. The default uninstaller kept some blank folders and one or two files within behind but had no such problems with removing drivers, registry entries and certificate. This is my experience but then again the experience may vary for another user.