By default, Windows 7 uses the highest experience level your computer is capable of.
If you want to change the experience level, complete the following steps:
1. Right-click an open area of the desktop and then select Personalize.
2. Select a theme to use. This sets the base experience level. In most cases, you'll have several Windows Aero themes to choose from as well as several basic and high contrast themes. If you choose a theme other than a Windows Aero theme, you'll be using a reduced experience level.
3. Click Windows Color to fine-tune the color settings as discussed in the previous section. If you are using the Windows Classic or Windows Basic theme, you will not be able to mix colors or set transparency as described in that section.
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