For the third time (OY don't ask me what I was doing this morning) How'd I comment on the wrong post? Caffeine plz.
I can't remember if the Dell 8400 has an intel or nvidia SATA controller (or both). You should probably download the drivers from Dell and copy them to a floppy as XP doesn't support loading drivers from a USB key yet, Vista will. XP doesn't have inbox drivers for SATA SATA/RAID controllers. Make sure the SATA controller is enabled in the BIOS. The OEM probably already set this or told you how to do this. Most OEM's preinstall OS's so the average user doesn't have to do these steps.
In addition. Set the SATA drive as the Primary boot HDD in the BIOS. It would probably be best to just unplug the IDE drive while installing Windows, otherwise, Windows is going to bypass the option to load the drivers for the SATA drive and simply default to the IDE drive for install. You might still get the STOP 7B error during the install. Try restarting and hitting F6 during install. Setup should prompt for storage drivers when it doesn't find them but not always.
Later, after plugging in the IDE drive - verify that the WD drive is still the Primary boot device under HDD in the boot device settings.
If you have an existing windows installation on the IDE drive, it won't be a problem, you can just rename the %windir% on your folder on your IDE drive to windows.old or something and migrate any needed data to your new installation. Providing you don't plan on using the older installation again.
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I can't remember if the Dell 8400 has an intel or nvidia SATA controller (or both). You should probably download the drivers from Dell and copy them to a floppy as XP doesn't support loading drivers from a USB key yet, Vista will. XP doesn't have inbox drivers for SATA SATA/RAID controllers. Make sure the SATA controller is enabled in the BIOS. The OEM probably already set this or told you how to do this. Most OEM's preinstall OS's so the average user doesn't have to do these steps.
In addition. Set the SATA drive as the Primary boot HDD in the BIOS. It would probably be best to just unplug the IDE drive while installing Windows, otherwise, Windows is going to bypass the option to load the drivers for the SATA drive and simply default to the IDE drive for install. You might still get the STOP 7B error during the install. Try restarting and hitting F6 during install. Setup should prompt for storage drivers when it doesn't find them but not always.
Later, after plugging in the IDE drive - verify that the WD drive is still the Primary boot device under HDD in the boot device settings.
If you have an existing windows installation on the IDE drive, it won't be a problem, you can just rename the %windir% on your folder on your IDE drive to windows.old or something and migrate any needed data to your new installation. Providing you don't plan on using the older installation again.