I just spent the last few days scrubbing and rebuilding a few new laptops and a desktop for work. It's unfortunate we purchased them retail because they contain the backup operating systems and drivers on separate "recovery partitions" and of course I forgot to create backup discs. I ran into problems with our new Hewlett Packard Pavilion dv6-1027nr Entertainment Notebook PC when I couldn't find two drivers listed here by their Hardware Id: ACPI\HPQ0004 and ACPI\ENE0100.
1. The Hardware ID ACPI\ENE0100 (found in the driver details of device manager) turned out to be the ENE CIR Receiver Driver found here.
2. The Hardware ID ACPI\HPQ0004 on an Microsoft ACPI-Compliant device turned out to be the ProtectSmart Hard Drive Protection for Microsoft Windows Vista security software found here.
It's a shame HP doesn't make it's HP Recovery Manager program available for download to those of us who accidentally delete it. HP could also really use an update and driver detection program that will tell you what drivers you're missing - it took me a while to figure these things out.
If I come across anymore ACPI Hardware ID's with hard to find drivers I will post them here. Feel free to leave comments if you find any as well.
The Hardware ID ACPI\MAT0021 on a Panasonic CF-F8 laptop is the Panasonic Misc. Driver. Learn more here.