Near the PCI slots, you’ll find FCC IDs. Search those numbers on theretroweb.com – they have pinouts and driver links.
Before you download anything, you must understand that “Packard Bell” did not manufacture the internal components. They assembled the PC using third-party hardware. The “Alp Ajax C3” is the motherboard/chassis codename. Specifically, the refers to the motherboard model (often an ECS or ASUS rebrand), while Ajax refers to the chipset configuration. packard bell alp ajax c3 drivers