How to perform a full virus scan while in safe mode with command prompt

Situation:

How do I start a Windows XP or Windows Server 2003 machine into Safe Mode with Command Prompt so that I may perform a full virus scan?

Solution:

Starting a machine into the mode Safe Mode with Command Prompt may prove to be more successful when removing an infectious threat since the explorer.exe process does not run in this mode.

For Symantec Endpoint Protection:

Isolate (disconnect) all affected machines from the network
Restart these machines into Safe Mode with Command Prompt. Immediately press F8 prior to the operating system load screen. This will display a startup menu with an option for Safe Mode with Command Prompt. Select this option.
After the computer has loaded into this mode, close the Command Prompt window that appears
Press CTRL+ALT+DEL to bring up task manager
Click File > New Task (Run...)
Browse to the install directory for Symantec Endpoint Protection. By default, this is C:\program files\symantec\symantec endpoint protection\
Select SymCorpUI.EXE and click Open
In the Create New Task window, click OK to run the application. This will open Symantec Endpoint Protection
On the left-hand side, click Scan For Threats.
Click Run Full Scan. This will start the scanning process immediately.

Note: Upon running SymCorpUI.EXE, a window may appear with the following message: "It appears that the Symantec Management Client service is not running. You will not be able to manage network protection settings through the main user interface until it is running. Do you want to start the service now?" Click No to this message

For Symantec AntiVirus:

Isolate (disconnect) all affected machines from the network
Restart these machines into Safe Mode with Command Prompt. Immediately press F8 prior to the operating system load screen. This will display a startup menu with an option for Safe Mode with Command Prompt. Select this option.
After the computer has loaded into this mode, close the Command Prompt window that appears
Press CTRL+ALT+DEL to bring up task manager
Click File > New Task (Run...)
Browse to the install directory for Symantec AntiVirus (C:\Program Files\Symantec AntiVirus by default)
Select VPC32.exe and click Open
In the Create New Task window, click OK to run the application. This will open Symantec AntiVirus
Click the Scan menu and select Full Scan
Click Scan at the bottom-right corner.