undertheweather,
Congratz on your new Dell.
For your Godson:
With the WinXP CD, you can do a fresh install of WinXP and during the install you have the option to delete a Partition. If you delete the partition and then create a new one, that will be enough to keep your 10 year old Godson from accessing any of your old files.
(I do not expect him to try any hacking of the old hard drive with data recovery tools to see what he might be able to find.)
Take Care,
Richard