why my windows 7 like a windows xp and the theme cannot change to windows 7 theme?

could possibly be,

graphics card failure or graphics drivers are missing or have become corrupt.

try reinstalling the graphics drivers.

then go

control panel > system > advanced system settings > advanced tab > in the performance box click on settings > check the box, adjust for best performance > Apply > OK

then try resetting the theme

.

precise click on reveal - customize. the somewhat some strategies are there. additionally, in case you acquire photos from exterior media alongside with a telephone, open them precise-click on the image and the context menu will supply you the choice to "set as computer history". observe that abode windows 7 helps you to apply a slideshow computer wherein you could adjust settings to allow the bvackground to alter at timed periods.

Sometimes it happen because you may be running a program that is for XP and not for 7..try running only a 7 program like a game.

scan for infections or try and personalise desktop, r/click on desktop and personalise, select a theme?