Change the Transition Effect for Menus and Tooltips

Start/Run/Regedit

"HKEY_CURRENT_USER\Control Panel\Desktop"

 Value Name: UserPreferencesMask Data Type: REG_BINARY (Binary Value) Double-click on the "UserPreferencesMask" value to open the Edit Binary Value screen. Press the right arrow to move over to the second set of digits. Press the delete key to remove the digits and type either '28' for the scroll effect or '3e' for the fade effect.

Restart Windows for the change to take effect.