Nope, you have a frankenbuild copy. Better download again. J/K, yes Windows 8.1 theme by default is the yellow.
Yes, you're right. as i only see one yellow background (in windows default theme)? is it normal? or my installation has error?
Change your background image.. What do you mean you only see yellow background.. As in the background image or the taskbar/window colors?
the window borders etc are doodoo yellow yes, the wallpaper is also doodoo. change theme change settings its all doodoo
Uhhh Installation error? No its no error. Windows 8.1s default theme is Yellow, with the pyramid looking background. You can change it. If you used your MSFT account from Windows 8, it should set to what ever theme/background you had before.