Error message that you receive when you restart a Windows XP-based computer: "lsass.exe unable to locate component"

To resolve this problem, follow these steps:

1. Insert the Windows XP disk in the CD drive or DVD drive on the computer. Press and hold down the SHIFT key as you insert the disk to prevent the Windows XP installation from automatically starting.
2. Click Start, click Run, type the following command, and then click OK:
   expand CD drive:\i386\ntdsapi.dl_ %SystemRoot%\windows\system32\ntdsapi.dll
3. Click Start, click Run, type cmd, and then click OK.
4. At the command prompt, type the following command, and then press ENTER: xcopy c:\windows\servicepackfiles\i386\ntdsapi.dll c:\windows\system32

http://support.microsoft.com/kb/922371/en-us