I can not setup windows xp in my dell latitude e6400 laptop.I set BIOS (F12), select "System Configuration", "SATA Operation" and i change it from "IRRT" to "ATA. But no work.When i start windows xp setup then it show STOP 0x0000007B(0xF78DA63C,0x0000034,0X x0000000,0x0000000 error message.What i do?? Please help me!

Unfortunately you are not alone on this matter. Most of what I am finding for the problem is software related. The general consensus is that the E6400 with Win XP has some big issues. Remove all of the pre-installed dell software, especially Dell Control Point, this is typically the cause of repeated bluescreens and frequent drops in Wifi and WLAN connectivity.

If that doesn't salve it you will have to get more technical. You need to be sure that the BIOS SATA Operations setting needs are changed from IRRT to AHCI because IRRT is supported in Windows 7 but not Windows XP.
Also check to see if the CD Drive is being recognized. If not check to see what version of BIOS, audio and video drivers are installed on the laptop. As of May 2010 - the latest versions for Windows XP Professional SP3 32-bit operating systems were as follows:

1. BIOS - A20 (E6400A20.EXE)
2. IDT Audio - 5.10.0.6274, A11 (R267815.exe)
3. Intel Video - 6.14.10.5029, A07 (A07_R212481.exe)

Dell reported they have had many cases with lockups and freezing on E6400's and the majority of the cases were resolved with updating the Intel Controller driver. Also, updating to the latest bios would be prudent if not done already. The system would need to be running either AHCI or IRRT Sata Operation in the bios to install this update though.

Go to http://www.intel.com/p/en_US/support/detect?iid=dc_iduu and click on the "Check your system for updates" button.

The other drivers you should be able to get from the dell website http://www.dell.com/support/troubleshooting/us/en/19/Product/latitude-e6400?~srd=true&sk=e6400&scat=sup

If you want to install Windows XP or configure a RAID array, you may need to change the SATA type in BIOS. here I will introduce some method of SATA settings in BIOS. SATA HDD(hard disk) has been more porpular because of the hight transferring speed and simple installation. If you want to Install a Windows XP in SATA hard disk. we offen need a floppy disk to save the additional driver of SATA/RAID. but the floppy isn't too easy to find. So we can do another method, modify the SATA type to compatible IDE or ATA mode, etc.
Notes: If your computer has installed some operating systems. Changing SATA types may corrupt your systems or need to be repaired again. But when can I change the SATA type?
1. You are prepairing install a new operating systems, for commonly Windows XP. If Windows 7/Vista will be installed. you need nothing changed in BIOS unless the setting has been modified.
2. Or you want to install a RAID.
I will introduce how to install Windows XP at SATA HDD(hard disk) in the coming chapters, here we need to know how to change the SATA type in BIOS. At first we need to access BIOS, Here is my desktop BIOS, we can find the BIOS is from AWARD software.
In my BIOS, the harddisk settings are in the line of integrated peripherals, different BIOS or different OEM menufactures may have different promise. you can try the Advanced BIOS features setting or Integrated peripherals, or system configuration, etc.
Locale to Integrated Peripherals and press enter, you may find the SATA configuration.
the above screenshot is the SATA configuration position. There are two items about SATA controller, Onchip SATA controller and Onchip SATA Type, Notes: There may be one or more configurations about SATA, we only need to change the SATA Type. you should not close the SATA controller if you don't know what's will be happened.
Navagete to the Onchip SATA Type and press ENTER, we can find these selections: Native IDE, AHCI, RAID. If you want to install Windows XP, you may need to change to Native IDE(some called ATA) mode, when you finished installation, you can refresh your SATA drivers in Windows XP and change the SATA type to AHCI mode in BIOS again.
If you want to configure a raid array. set to RAID similarity. When finished settings, you should press enter to accept it, and save to CMOS before restart your computer. In my BIOS, I need to exit to the BIOS main menu at first and save it.
when the new status has been saved, you can press CTRL+ALT+DEL to restart your computer, some OEM PCs may need to click the EXIT or Save to CMOS and Exit, the computer will be restart automatically.
Another example screenshot is my DELL notebook BIOS. DELL BIOS is not the same as the desktop BIOS, we can find the SATA operation behind the System Configuration. there are only three selections (Disabled, ATA, AHCI). If you want to install Windows XP, here need to be changed as ATA mode.
Notes: If you want to install operating systems, you may need to change the boot orderto boot from your CD/DVD drive.

change the battery inside the computer on the motherboard then fix bios setting and them save and reboot should work fine then battery dead

You need a Windows XP installation CD and the producy installation code.
Boot up with the Windows installation CD and then follow the instruction that is displayed.
When Windows has finished installing then you will need to install your laptop's device drivers.
You can download the device drivers from Dell WEB site,the support download page. Make sure you select your model desktop or laptop,better still, type in the Service Tag number, it is printed on the label on thebottom of the laptop and on the back or sides of a desktop. (If the Service Taglabel is missing then go into the BIOS setting and on one of the BIOS pages,the Service Tag number will be displayed). This will open the page where thespecific drivers for your model computer are located. Also make sure you selectthe Windows of the drivers for your Windows operating system. Click on thislink to download the drivers: - http://support.dell.com/support/downloads/index.aspx?c=us&l=en&s=gen

Hit F12 at the Dell logo screen when you first turn on the computer. Run the diagnostic to test the hard drive. I'm 99% sure the dirve is bad.

If you try to run XP setup without changing the BIOS SATA setting to ATA mode, setup will BSOD with an 0X0000007B error. Make sure the SATA setting in the BIOS is ATA...

you will get this error when you will be booting your system from CD and windows installation will be in first step.

to resolve it, go to BIOS setting-->change BIOS SATA setting to ATA mode--->apply changes-->insert windows CD and restart the system-->press f12--->nd boot from CD....hope u will be able to resolve it.

Press F12 as you boot up the Dell and select the CD as the alternate boot device, insert the Windows installation CD in the CD drive and continue.
If you can't select the CD as the alternate boot device then go into the BIOS configuration then the Boot order and select the CD as the first boot device, save and exit. You can change it back after Windows is installed if you wish.

Hi there.
Use the Vista CD to create the new partition, but first you have to delete the old partition first, (the 220GB partition not the 10GB one because that will be the recovery partition).
Get a calculator and work out your new partition, for example 50GB is 50x1024MB so that will be 51200MB.
When you have deleted the 220GB partition select NEW and input your newly worked out partition and carry on from there, to activate the other partition just format it.

Please post back with the results and for anymore help if needed.

Good luck and thanks for using FixYa!!

go to bios setup n change sata driver to ATA from AHCI n  also disable da flash play module

enable "auto" in BIOS for drive #0 and drive #1. you can select IDE or SATA drive. restart the machine.