Try to get his product key.
"Annie Dumas" <Annie Dumas@discussions.microsoft.com> wrote in message
news:E739B2A7-8289-41F8-8959-004FEC57C68B@microsoft.com...
> I'm trying to re-install Windows XP on an old PC which was having trouble,
> but I lost the original "restore" disk my manufacturer (Toshiba) gave me
> with
> my computer. My brother lent me his copy of Windows XP Pro and I am trying
> to
> install it using the Product Key on the bottom of my laptop, but the code
> on
> my laptop doesn't work with his Windows CD. My computer came with Windows
> XP
> sans SP2 and his CD has SP2 on it; does this make a difference? Why won't
> my
> pre-SP2 Product KEy work with his SP2 copy of Windows?