I got a desktop PC from a friend and it was supposed to be fully rebuilt with XP. However when I turn the computer on it freezes at the XP boot up screen. I tried to boot up in safe mode but it came up with a message to say xp hadn't been installed fully.

How do i fix this? Do i have to delete the current XP and install it again? and if so how do i go about doing that?

Thanks in advance for any help

As you've described XP isn't fully installed.

So the only way forward is to install it correctly.

Original XP CD into CD drive. Boot & away you go.