1. Remove the last application or hardware installed to determine drivers and system errors. If Windows XP software suddenly engages in an odd behavior not previously experienced, there may be a software or hardware conflict. A certain driver or system file may not be fully compatible with the operating system’s current state, resulting in frequent errors in your system. Write down the error and perform an Internet search on it. If the issue is widely known, there may be an effective solution to fix errors in Windows XP software that can eradicate the source of the problem.
2. Press the “F8” key as your computer is starting up. Select the option “Use the last known configuration that worked” from the Advanced Boot Options screen. This option is used to restore all system settings to the last successful startup session, providing you with a better chance to fix errors in Windows XP. Oftentimes, selecting this option eliminates software-related 'blue screen' errors and other mild installation issues.

3. Select “Safe Mode” to troubleshoot and fix all Windows XP severe problems. Launch Safe Mode by pressing “F8” during startup, and your computer will enter a modified Windows XP session with most networking and performance settings disabled. This is useful in the event that a blue screen error prevents you from successfully accessing Windows XP regularly. Diagnose the issue by accessing the Windows registry, uninstalling previously installed software or making any kind of modification you believe might fix Windows XP. Removing or modifying one setting at a time is best to pin point the exact cause of the problem.
4. Perform a Windows XP System Restore from Safe Mode. If all else fails, launch this handy recovery tool to revert Windows XP to an earlier date when it performed more effectively. This is a convenient way to fix errors in Windows XP software, especially when they have been caused by a program malfunction. Select “Start,” choose “Programs,” click “Accessories,” select “System Tools” and click “System Restore.” Choose the date to which you would like Windows XP to revert to, and allow it several minutes to perform the task.