Which DV5000 do you have? There are three to choose from;
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Is there a functioning O/S on the unit now?
Is the Drive Lock enabled? (Security Menu)
(DriveLock Settings are accessible only when you enter Computer Setup by turning
on (not restarting) the computer. When the red Compaq logo appears, press the F10 key on the keyboard to enter setup.)
Did it come from the factory with Vista? (Below from;
HP Notebook PCs*-* Problems with Installing or Uninstalling Windows Vista*)
My PC came with Vista, but can I install XP? HP does not recommend installing Windows XP on a notebook that came with Vista installed. Before taking such a step, check to see if your model had an XP version as well as a Vista version. If so, you may be able to use the XP version's drivers and BIOS. If not, you may need to search the Microsoft web site ( Microsoft Corporation ) for generic drivers that will allow your computer to run properly. These generic drivers will not have the full functionality of those provided by the hardware manufacturers, who designed their devices to work specifically with your computer and with Windows Vista. I want to try using Windows Vista, but how do I get back to Windows XP if I don't like it? If you have a notebook running Windows XP, before you do anything to upgrade the PC, you should create a set of Backup and Recovery discs for Windows XP. With recovery discs you can always get the PC to a known, stable, working condition.
If you do not create a set of XP Backup and Recovery discs or if the discs are lost, you may do one of the following actions.
If your notebook was purchased from HP and came with Windows XP installed, you can order an extra set of Windows XP Recovery discs from HP.
If this is not the case, you will need to purchase the Windows XP operating system discs from an authorized retailer.