I have a vostro 1700, and experience in dealing with dell support. It seems to depend where you are from, if your in the USA you can probably get them to send you an XP disk, and maybe blag a free printer or if your very lucky a 19" LCD panel. If your in the UK you will get messed around a lot and get nowhere. Thats what happened to me anyways, and the jist i got from notebookreview.com.
If you do manage to get an XP disk off of them (dont let them tell you XP wont work, it does work) make sure you follow certain instructions, do what this guy did:
http://forum.notebookreview.com/showthread.php?t=150023
You need the ICH8 ACPI driver either slipstreamed to a CD using n-lite or have it ready to install at some point otherwise XP will bluescreen on startup and the only way to stop that is to use the slower ATA mode in the bios instead of ACPI and you dont want to do that because ATA is slower and there is apparently no way to switch back to ACPI unless you reinstall windows again. But you dont need to worry about that if you slipstream the ICH8 driver from the dell website onto an XP CD.