I've installed XP on mine now, mostly it was fine but there were a few driver hiccups. As I mentioned above, you'll need to slipstream the AHCI drivers for the SATA HDD into your Windows XP disk, or turn the HDD mode in the bios to "IDE" from "AHCI" (loss in performance?).
After installing the Dell Bluetooth drivers, Bluetooth went wacky for a bit, it kept prompting me that an application was attempting to access my hands free kit (?!), which a reboot solved. Now got my Bluetooth mouse and wireless headset (which hadn't been paired when I was getting my Bluetooth errors) working perfectly.
Integrated webcam did not need Creative drivers from Dell web site, XP Pro picked it up. I've seen myself in the Camera window in My Computer, but not tried a video application yet- I assume it will be fine.
Chipset driver installation borked my USB hub, so I removed the problematic USB devices from Device Manager (about 8 of them), and rebooted- I let XP pick up the driver installation and they worked fine.
Nvidia drivers from Dell installed a treat, but no testing yet on performance or OC'ing with Ntune.
The sound card installation was a pest, the driver setup looked good for a few seconds then just dissapeared with no errors, a result of no sound. A reboot caused the setup to pick up automatically, but resorted in an error of "no supported device found" or something. Updating drivers manually in the Device Manager (unknown PCI device, had to remove it and reboot), and pointing it to the folder where the sound setup had unpacked to, automatically installed the driver correctly. I then had to configure Windows to use the Sigmatel device as standard, rather then route all sounds through Bluetooth (I foolishly setup Bluetooth before sound, but the Dell drivers are all named Rnnnnn.exe where n is a load of numbers!).
After removing the PCI device above (which I think is the "High Def Audio Bus"), which enabled me to install my sound, the last thing required was the dial up modem, which I don't need but I just like having drivers for everything. Dell forums insinuated the driver is Vista only, but a different driver (Conexant D330,HDA,MDC,v.92,modem) seemed to install correctly. I haven't tried this TBH, but just like having a clean Device Manager
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Driver linky