Here’s a clear, step-by-step text you can use for a guide, tutorial, or help document on wiping a Windows XP computer. Wiping a Windows XP computer removes all personal files, programs, and settings. This is useful before selling, recycling, or donating the PC, or to fix major system issues. Since Microsoft no longer supports XP, ensure you have your original XP installation CD (or an ISO file) and the product key before starting.