HP Pavilion a6244n Windows XP Driver
When you boot into the BIOS, you can change the HD controller from SATA to
IDE. Even though you have a SATA hard drive in your system, it will work
with no need to load drivers by pressing F6.
After installing you might need this drivers and its already available at intel site. In any case if the driver link given broken, just search the name of the driver given.
Chipset drivers: Intel 945G Chipset
Realtek HD Audio: