If you don't have a disk, then you can't reinstall, unless there is what's
called a "recovery partition".
You can of course format the drive, but that isn't going to help you a lot,
as once that's done, the system won't have an operating system till you
install one.
You can borrow an XP boot CD and format using that - there isn't really any
licensing issue using an XP CD for this - or you can attach the drive to
another system and format it from there.
I suspect that what you ultimately wanted to do goes a bit further than just
formatting the drive. More details on that might get you more information.
Unless your friend provided you with either the CDs needed to do a
reinstall, or instructions for performing a reinstall based on the
on-disk partition/s, AND gave the current key code to use, all you
bought was a piece of hardware. You still need to buy an operating
system and any other programs you want to use.
Go back and ask the friend; he'll know what's what. The most
important thing you need to do is get an operating system installed and
get it activated.
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