He already has his HD set as first boot, so if the install took properly it should be booting. Still, changing the boot order as you said is a good idea
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From another MB (shuttle) website:
1. Boot up from CD-ROM with Win2000/XP CD
2. The message " Press F6 if you need to install a third party SCSI or RAID driver..." will appear at the bottom of the initial OS setup screen. Press <F6> few time in order to install RAID driver prior Windows200/XP installation.
3. When the "Windows 2000/XP Setup" window is generated, press "S" to Specify Additional Devices.
4. Insert the Windows 2000/XP RAID driver floppy disk in drive A: and press <Enter> key.
5 Highlight (name of your RAID Controller for WinXP) then press <Enter> key
6. Press "S" to use the driver on floppy
7. If you need to specify any additional devices to be installed, do so at this time.
8. Once all RAID/SCSI devices are specified and respective driver installed continue with Win2000/XP installation.
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Might be easier to reinstall. Change boot order as suggested so you boot off the XP CD first, HD second.
Whether you do the F6 thing is up to you (I didn't go SATA on my new machine, so I'll take someone else's word that you don't have to). If this is a new HD, the existing OS is the XP you just installed but now want to replace, so you would want to overwrite it.