The steps below will require a Windows XP restart of your computer. Be sure to save / close all open files before proceeding.
1. First, on your keyboard locate your F8 Key that you will use during restart. It's usually located at the top of your keyboard keys. Just remember the location since it will be used after step #3.
2. Click on Start and choose Turn Off Computer.
3. Click on Restart as shown in the example.
4. Your computer should begin to restart. Allow a few moments for Windows to logoff and shut down. Once the Windows begins to restart, press + hold-down the F8 key to get into Safe mode which should bring up the "Windows Advanced Options Menu". Use your arrow keys to highlight Safe Mode and press Enter like the example below.
Note: On some computers you may need to press the F8 key repeatedly during restart, like tapping the key every second during restart, instead of holding-down the key.
Related: Start Windows XP in Safe Mode