DIAGNOSIS Error 0xc19a003a is an HP driver installation failure. It is typically caused by conflicts with existing printer drivers or corrupted Windows installer files.
FIX Do not use the installation CD or a full download from HP's website. Use the Microsoft Store method. On your Windows computer, open the Microsoft Store and search for 'HP Smart'. Install this app. Run 'HP Smart' and click 'Add Printer'. It will guide you through a streamlined setup. Ensure your 9125e is powered on and connected to the same Wi-Fi network as your computer during this process.
IF THAT DIDN'T WORK You must completely remove all traces of previous HP software. Go to Windows Settings > Apps. Uninstall anything named 'HP', 'HP OfficeJet Pro 9120/9130 series', or 'HP Print and Scan Doctor'. Restart your computer. Then, download and run the 'HP Customer Support - HP OfficeJet Pro 9120 All-in-One Printer' software directly from the official HP support site, selecting the 'Basic Drivers' option during the download.
HEADS UP The 'HP Smart' app is now HP's primary software for consumer printers and is the most reliable installation path. Avoid the 'Full Feature Software' suite if you encounter this error, as it is the most common source of the 0xc19a003a conflict.