eeh.. I don't have the OS cd or the windows key
I would Clean install also, if giving the computer away
But the user doesn't have CD or key
and it doesn't appear the computer has a Recovery partition
Uninstall any programs you don't need
I like to use Revo uninstaller for this, you can just use Add/remove programs
Any files you don't need, you can delete, or better yet, use a Shredder program
Such as Eraser, or again, Revo Uninstaller has one built in
After you have uninstalled programs, deleted any files/folders not needed
Make a new User account with admin privileges
Log off your account, sign into the new account, or go into safe mode and enter the hidden Admin account
Delete your user, and Delete files at the prompt
If you want to change the Registered too...... in MyComputer, it's just a registry setting