This article explains how to resolve the System error LSASS.EXE object name not found error in the Windows XP operating system.

	Note:
	LSASS.EXE is a required system file that, if damaged or deleted, causes the system to lockup booting to any mode. This file can be recovered by using the Recovery Console feature in Windows XP. Because of differences in the operating systems, two methods enable access to the Recovery Console.

1. Insert the Operating System CD for the Reinstallation of Windows XP in the CD drive.
   
   
2. Power on the computer and press the <F2> key to enter the system setup.
   
   
3. Set the CD drive as the First boot device.
   
   

   	Note:
   	For additional information on how to boot your computer from the CD drive, refer to the following Dell Knowledge Base Articles: "How Do I Configure My Dell Dimension Series System to Boot to the CD Drive" Article ID: 147732 "How Do I Configure My Dell Inspiron Portable Computer to Boot from the CD Drive" Article ID: 147738 "How do I configure my Dell Latitude C series or L series system to boot to the CD or DVD drive" Article ID: 147839 "How do I configure my Dell OptiPlex system to boot to the CD or DVD drive" Article ID: 147846

   
   
4. Press the <Esc> key to exit and save the settings and the system will reboot.
   
   
5. In the prompt to Boot to CDROM or Hard Drive screen, select CDROM by using the arrow keys on the keyboard, and then press the <Enter> key.
   
   
6. The Windows XP setup begins.
   
   
7. In a prompt for the type of XP setup, press the <R> key to select Recovery Console.
   
   
8. In a prompt to Choose the Windows installation you want to repair, press the <1> key, and then press the <Enter> key.
   
   
9. In a password prompt, press the <Enter> key.
   
   
10. In a C:\windows\> prompt, change directory to the C:\windows\system32\dllcache folder by typing the following text:
    
    cd \windows\system32\dllcache
    
    

    	Note:
    	Ensure you press the <Spacebar> key between cd and \

    
    
11. Press the <Enter> key.
    
    
12. Copy the LSASS.EXE file to C:\windows\system32 by typing the following command at the C:\windows\system32\dllcache> prompt:
    
    copy LSASS.EXE C:\windows\system32\LSASS.EXE
    
    
13. Press the <Enter> key.
    
    

    	Note:
    	If the above steps fail, try the following alternate method: Change directory to the D:/i386 (or your cdrom drive's drive letter) directory by typing cd D:/i386 and press <Enter>.  Type expand lsass.ex_ %systemroot%/system32 and press <Enter>. Type C: and press <Enter>. Type cd %systemroot%/system32 (or your chosen windows partition drive letter)  attrib lsass.ex_ -r Dir lsas*.* and press <Enter>. Rename lsass.exe to lsass.old (if the file already exists) by typing rename lsass.ex_ lsass.exe and press <Enter>.

    
    
14. Remove the CD from the computer.
    
    
15. Type the following text at the C:\windows\system32\dllcache> prompt:
    
    Exit
    
    
16. Press the <Enter> key.
    
    
17. The computer reboots.

The system should boot normally.

1. Navigate to the "Windows XP Home Edition Utility: Setup Disks for Floppy Boot Install" site.
   
   
2. Download the file to the desktop, and then double-click the file.
   
   
3. Once the diskettes are created, take them back to affected system, and insert Diskette 1 into the floppy drive.
   
   
4. Power the affected system on.
   
   
5. After booting to the first of the six diskettes, insert the Windows XP CD into the CD drive.
   
   
6. Insert and eject each of the remaining diskettes as the computer prompts.
   
   
7. After the sixth diskette loads, press the <R> key to select Recovery Console.
   
   
8. In a prompt for the Windows installation you want to repair, press the <1> key, then press the <Enter> key.
   
   
9. In a password prompt, press the <Enter> key.
   
   
10. In a c:\windows\> prompt, type:
    
    cd \windows\system32\dllcache
    
    

    	Note:
    	Ensure you press the <spacebar> key between cd and \

    
    
11. Press the <Enter> key.
    
    
12. Copy the LSASS.EXE file by typing =:
    
    copy LSASS.EXE C:\windows\system32\LSASS.EXE
    
    
13. Press the <Enter> key.
    
    
14. Remove the diskette and CD from system.
    
    
15. Type the following text:
    
    Exit
    
    
16. Press the <Enter> key.

The system will reboot. The system should boot normally.

1. Insert the Windows XP CD into the CD drive and restart the computer.
   
   
2. At the Press any key to boot from CD prompt, press the <Spacebar> to display the Windows Setup screen and load several files.
   
   
3. Press the <R> key.
   
   
4. If prompted, select the number corresponding to the Windows installation you want to log into (usually C:\WINDOWS).
   
   
5. Press the <Enter> key.
   
   
6. Enter the Administrator password, if any, and press the <Enter> key on the keyboard to display the C:\WINDOWS> prompt.
   
   If the system fails to boot, the following method of recovery is not possible.

	Notice:
	Using System Restore to revert the computer to an earlier state may delete data in folders other than the Documents and Settings folder. If you have data in other folders that have changed since the date and time of the point to which you are restoring, back up the data before using System Restore. For more information, see Dell Knowledge Base Article: "How to Back Up Vital Data in Microsoft® Windows® XP" Article ID: 291601.

To restore the computer to a previous state:

1. Click Start, and then click Help and Support.

2. In the Help and Support Center window under Pick a task, click Undo changes to your computer with System Restore.

3. In the Welcome to System Restore window, click Restore my computer to an earlier time, and then click Next.

4. In the System Restore window, click Select a Restore Point page.

   	Note:
   	The calendar on the left displays dates in bold. These dates are the restore points. The list on the right displays the restore points available for the selected date.

5. On the calendar, click a date to which you want to restore. Then, on the list, click the restore point that you want. Select a date and restore point on which you know the computer was working correctly.

6. Click Next.

7. In the Confirm Restore Point Selection page, verify that the restore point that is listed is the one you selected, and then click Next.

8. After the computer restarts and the Restoration Complete page of the System Restore window appears, click OK.

9. Verify whether restoring the computer to the previous configuration resolves the issue. If the issue still occurs, try restoring the computer to an earlier restore point.

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