The device was "Microsoft Away Mode System" and was incompatible with 64-bit Windows 7. Installing 32-bit Windows 7 solved the problem.
I'm trying to get Windows 7 up and running on a 2006-era HP Pavillion d4500y. I'm getting intermittent BSOD and my only lead is an Unknown Device in Device Manager.
In the past (on other computers) I've had luck with finding a Vendor ID and Device ID from the "Device Instance ID" property, but this particular device doesn't have a "Device Instance ID."
However, there is a "Device Instance Path" property which shows ACPI\AWY0001\2&DABA3FF&2. Also, the "Parent" device is listed as ACPI_HAL\PNP0C08\0. Googling around with these strings hasn't helped me identify it, so I'm hoping you guys know something I don't. Any help is greatly appreciated.