Themes location: %USERPROFILE%AppDataLocalMicrosoftWindowsThemes   Navigating/Changing desktop background/wallpaper using keyboard: Turn to desktop, you can use the Windows Application key (the key between Window key and Ctrl key) or Shift + F10 instead => right click menu will appear and press N key. That’s all.   Themes Resources: http://windows.microsoft.com/en-IN/windows/downloads/personalize http://www.technospot.net/blogs/download-free-windows-7-themes-styles/ http://www.addictivetips.com/windows-tips/download-windows-7-themes/ http://www.windows-7-themepack.com/home.php

Windows 7 diagnostic logs path:  “%USERPROFILE%AppDataLocalElevatedDiagnostics”