The 2A99 board has multiple revisions. Knowing yours prevents driver conflicts.
Since the board uses standard NVIDIA components, you can often find compatible drivers through the NVIDIA Driver Archive nForce 430/GeForce 6150 (MCP61) Key Specifications & Limitations Does my motherboard support 8GB of DDR3 25 June 2016 — Pegatron Corporation 2a99 Motherboard Drivers
: American Megatrends Inc. (AMI). The latest reported version is 6.14 Rev. A (March 2011). Essential Drivers for This Board The 2A99 board has multiple revisions
Check your hardware ID. Two possibilities: Pegatron Corporation 2a99 Motherboard Drivers