|Startup disks are not OS disks. Regardless of whether or not you have a boot floppy, you'd still need to buy the OS installation CD. eBay is a good place to start.|
Is your intent to install 2000 and completely remove XP? If so, you'd need to check the Dell Support site (enter your ST) and make sure the 2K drivers are available for your system.
AND, you can't install Windows 2000 as a dual boot when you already have XP. You'd have to install 2000, completely formatting the OS partition (losing all data), then install XP as the dual boot option.
"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown