Hey Guys i had the same thing with the latest version of DP and a Acer Aspire T135-S97Z desktop PC.
I managed to install the WinXpHome with DP integretad to a 80 Gb IDE disk. Once the OS was installed i saw that the needed Sata was the one with "VIA Serial ATA Controller - 3149" caption in Devmgmt
I opened the VIPRT.inf file and in the [Strings] section of the file i found an exact match to that caption.
I then hooked up a SATA drive and tried to install with the same WinXpHome with integrated DP. This failed stating that there where no drives connected. SATA drive was working fine (tested with Hiren's Boot CD). So i decided to try again with an fresh WinXpHome OEM install CD with NO driverpacks added to it and voila now it can install to that SATA drive.
Hopefully this info means something to you ...