The error chime was part of the default sound scheme in Windows XP, the Microsoft operating system released in 2001 and used on hundreds of millions of PCs. For years it was heard daily in offices, schools and homes whenever a dialog box blocked an action. As XP faded from everyday use, the sound survived online in tutorials, parody crash videos and collections of error sounds. Its nostalgic, slightly dated tone now signals a retro computer failure more clearly than any modern alert, which is why editors still reach for it.