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To change a theme, go to Start menu, control panel then click on Appearance and Personalization. Next the window will open and under Personalization click on Change theme. You can use inbuilt themes or you can search for more themes online.
On the inbuilt, you can use Basic and High contrast themes or Aero themes. Just click on any theme and wait for a few seconds for the theme to apply. Once that is done you can continue with your other tasks or change it again until to get the one you want.