You should have a whatever.inf file on the floppy - don't bother
finding setup.exe. You can right click the .inf file and click
Install in the commands drop down menu; if you want to see what's in
the .inf file, click the Edit command in same menu list. Also, you
can install the .inf via Hardware Wizard.
Otherwise, if you did not install HDD yet:
Install the hard-drive (HDD), boot and open BIOS. You should find
the new SATA HDD installed - but might be presented as an IDE HDD -
pending your mobo and BIOS. Navigate BIOS and check if there is a
SATA (controller) enable option - theree might be none but the SATA
Raid option which you don't need. If you have to install the
controller, you might need to reboot. Pending your mobo setup, you
might need to install HDD drivers in Windows first... but very
unlikely. After HDD is 'seen' in BIOS' start XP. The Hardware Wizard might
discover the new HDD - unlikely, though, since the HDD is not
formatted for XP; if the Wizard finds it, just feed it the drivers
from the floppy - find the .inf file.
If Hardware Wizard does not start, go Control Panel/ Administrative
Tools/Computer Management/Disk Management and you should see your
SATA HDD there. Right click and check Properties or Format options.
Use the same format as for the other HDD(s) you have installed; NTSF
is recommended at least for safety reasons.
Michael