Windows XP 64 bit drivers for D531

Just got the laptop, and I decided to put XP 64-bit on it. I downloaded and installed all the drivers for Windows XP 64-bit from dell's site (everything but the BIOS and DVD firmware, because there were no new versions), but I am still unable to get valid drivers for the following devices:

Ethernet Controller (although the wireless is working)

Modem Device on High Definition Audio Bus