There are a lot of driver missing when downgrade from xp to vista and 7 unknown devices is quite a popular topic discussed. And there are also other driver such as co processor. When downgrading for me the essential driver is chipset, sound, vga, wireless, bluetooth and card reader. So what to do with missing driver, for me if nothing wrong with your laptop no need for you to update the driver because you already have the essentials drivers.
Hp 630 Laptop Drivers Free Download For Windows 7,Xp!
Model: HP Compaq 630 Series /(Energy Star)
Compatibility: Windows XP 32-bit, Windows XP 64-bit , Windows 7 32-bit, Windows 7 64-bit
The great thing about this model is HP release drivers for both windows XP and Windows 7, Windows Vista is not available but normally windows 7 drivers works with windows Vista. I rebuild the list by removing unwanted utilities and duplicate drivers with different version.
Install all 4 drivers, all support windows XP and Windows 7
Intel Chipset Installation Utility and
Version 18.104.22.1685 , 2.4 MB (xp,7) Download