GHacks.net posted a guide about disabling Windows Aero Transparency in Windows 7

The main reason for not using Windows Aero under Windows 7 was the transparency effect that was automatically applied to all open windows. That did not only make some menu items harder to read, but made the screenshots look unprofessional as the desktop background or folder background was shining through because of the transparency.

  How To Disable Windows Aero Transparency In Windows 7