Try to reset the theme first, that is, right-click Desktop-Properties-Appearance, select a different appearance, and then go back to Windows xp and click Apply ~
If not, change the theme, such as the classic style of Windows, and see if it is restored. If possible, it's the theme of the original.
Yes or no … enter safe mode to see if it is still the same. If so, basically eliminate the interference of software ... It may be the system itself.
Nothing more … just the ultimate fix script for Microsoft programmers …