1. Note the exact error code reported on the blue screen. The screen displays information similar to 'Stop 0x000 (numbers)' where the 0x000 is the actual error code. Record that code along with any file names reported.
2. Visit the Microsoft Knowledge Base and enter the code along with 'Windows XP' into the search box. Microsoft may already have a resolution and instructions for correction.

3. Note when the error first occurred. If you recently installed any new hardware, such as a printer or scanner, disconnect it from the computer and remove any associated programs installed. Restart the computer. If the error does not occur, the hardware drivers caused the conflict. Visit the hardware manufacturer's website and check for updated drivers compatible with Windows XP.
4. Remove a recently installed program if the error appeared following installation. Click 'Start,' 'Control Panel' and choose 'Add/Remove Programs.' Click on the program and choose 'Remove.' Restart the computer. If the error does not occur, the program caused the conflict. Visit the software manufacturer's website and check for software patches or any special Windows XP installation instructions.
5. Click 'Start,' and 'Run.' Type 'MSCONFIG' in the 'Open' box. Click the 'Start Up' tab, and click the 'Disable All' button in the bottom right corner. Click 'Apply' and restart the computer. Verify that you wish to use the 'Selective Start Up' at the prompt. Use the computer normally. If the error message does not appear, a 'Start Up' program is causing the problem. Return to the 'MSCONFIG' dialog window, click the 'Start Up' tab and place a check mark on the first program. Restart the computer and check for the error. Repeat the process for all 'Start Up' programs until the error occurs and identifies the program causing the conflict.
6. Click 'Start,' and 'Run.' Type 'MSCONFIG' in the 'Open' box. Click the 'Services' tab and mark the box next to 'Hide all Microsoft Services.' Click 'Disable All' and 'Apply.' Restart the computer and check for the error. If the error does not occur, a service is causing the problem. Return to the 'MSCONFIG' dialog window and click on the first service to start it. Restart the computer and test for the error. Repeat the process, one service at a time, until the error occurs.
7. Click 'Send Error Report' if Microsoft's error reporting tool pops up. Click 'More Information' when the confirmation window appears to view information and possible solutions. If no solution is available, click 'Advanced Troubleshooting.' Microsoft recommends contacting customer support if you are not comfortable trying the advanced methods.