Since it probably came with Vista (which is end of life now), it may be time to consider Windows 10 for it.
If you really need a Dell Vista disc, they appear routinely on EBay -- your license key is in the battery compartment, so all you need is an OEM Dell DVD with the same version of Vista on it.
Thanks yeah I figured that may be my only option. I only want the disk because it has the normally pre-installed software. I need the software for my fingerprint scanner that I cannot find anywhere else.