"Error 2" when starting the Windows Firewall service

Symptoms

When you try to start the Windows Firewall service in a Windows XP Service Pack 2 computer, the following error may occur:

Could not start the Windows Firewall/Internet Connection Sharing (ICS) service on Local Computer.

Error 2: The system cannot find the file specified.

Also, the following event may be recorded in the Windows Event Log:

Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7023
Date:
Time:
User: N/A
Computer:
Description:
The Windows Firewall/Internet Connection Sharing (ICS) service terminated with the following error:
The system cannot find the file specified.

Resolution

This problem occurs if one or both of the files ipnathlp.dll or ipnat.sys are missing. To resolve this problem, extract a new copy of the missing file from the Windows XP CD-ROM. Ipnathlp.dll should be present in the %systemroot%\system32 folder, and ipnat.sys should be present in the %systemroot%\system32\drivers folder on the computer's hard disk. To extract the missing files, follow these steps:

• Insert the Windows XP disk into the CD drive.
• Click Start, click Run, type cmd in the Open box, and then click OK
• At the command prompt, type the following command, and then press ENTER.

expand X:\i386\ipnathlp.dl_ %systemroot%\system32\ipnathlp.dll

• Similarly, expand ipnat.sys file to the Drivers folder. Use the following command:

expand X:\i386\ipnat.sy_ %systemroot%\system32\drivers\ipnat.sys

NOTE

1. Where X:\ represents the letter of the computer's CD drive. And the %systemroot% environment variable represents the path and folder in which the Windows is installed. For example, if the CD-ROM drive-lettter is E and Windows is installed in C:\Windows, run the following command:
   
   expand E:\i386\ipnathlp.dl_ C:\Windows\system32\ipnathlp.dll
   
2. To close the command prompt, type exit, and then press ENTER. Restart Windows.
3. Use the %systemroot%\ServicePackFiles\i386 folder as the source path (instead of using the Windows XP CD-ROM as the source), if the following conditions are true:
   
• You installed Windows XP SP2 from a Windows XP SP2 CD that included SP2 as part of the base installation.
• You downloaded and installed Windows XP SP2 from the Microsoft Web site.
• Note If the ServicePackFiles folder is not present on the computer, you can copy the files from a slipstreamed Windows XP SP2 installation CD.