jajaes said:
ultimate 32 bit. model number is compaq mini 110c-1100dx. hdd is samsung hm160hi.
Explains
How to Add Serial ATA (SATA) Drives to a Windows Installation Compaq Mini 110c-1100DX PC - HP technical support (United Kingdom - English)

Determine the type of processor in the computer, then search for and download the latest SATA AHCI driver from the processor manufacturer's web site. Some SATA AHCI drivers are available on the www.hp.com web site.

Search "1100DX"
Search HP United Kingdom - Results - 'compaq mini 110c-1100dx pc | sata ahci driver'
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Sata/scsi Driver
Intel SATA AHCI Controller Driver - HP technical support (United Kingdom - English)
Only available for XP - I'm now out of my depth as I haven't installed/upgraded Atom with Win7!
Try compatability mode if Win 7 refuses to load any driver

Win7 will auto-instal latest drivers it has from internet servers. If it doesn't find any for your pc they are below. Install any older drivers in compatability mode

Main Win 7 drivers and bumpf

Software & Driver Downloads Compaq Mini 110c-1100DX PC - HP technical support (United Kingdom - English)