Need Service Pack 1 for XP Home

So a friend of mine has a XP Home disk and its SP0 (or RTM) and he wants to install XP home and use it on his old dell dimension 2400 pc and i need atleast SP1 to install SP3 so thats why i need SP1. And i don really trust 3rd party websites giving downloads to SP1 :)

-WindowsXPforever :p