Pegatron 2A99 is not a standard retail motherboard — it's an OEM board typically found in HP Pavilion p6000, p7000, and a6000 series desktops (circa 2010–2012). Because of this, Pegatron itself does not offer public drivers. The correct source is HP's support website, using the specific HP desktop model, not the board name.
Since there is no official "Pegatron Support" website for home users, use these reliable methods: Which CPU's can be used on this Motherboard? - HP Community pegatron corporation 2a99 motherboard drivers best
page. Enter your PC's serial number or model name (e.g., Pavilion G5400 series) to get the original validated drivers for Windows 7 or earlier. NVIDIA (Chipset & Graphics): For the motherboard chipset and integrated video, use the NVIDIA Driver Downloads site. Search for drivers for the nForce 6 series GeForce 6 series Third-Party Repositories: Pegatron 2A99 is not a standard retail motherboard
Processor Support: Socket AM3 (938), compatible with AMD Phenom II and Athlon II processors. Use Windows Device Manager to get Hardware IDs
If you are not using a dedicated GPU, you will need the legacy NVIDIA graphics driver. Note that this integrated chip is very old and may not support hardware acceleration in Windows 10/11. LAN (Realtek or NVIDIA):
If you share your full HP desktop model (or hardware IDs from Device Manager), I can give you direct download links.