If the Component Palette has disappeared, try selecting: View | Component Palette as shown in the image below.
Likewise, if the Data Palette has disappeared, try selecting: View | Data Palette
If this doesn't work, select:
View | Reset Menus.
View | Reset Layout
If this doesn't resolve the issue, try the following:
1. Exit FluidFlow.
2. Using "My Computer", navigate to the following file path:
C:\Users\Public\Documents\Flite\FluidFlow3\Preferences\[NAME]\345
Note, older versions of FluidFlow have a different file path which is as follows:
C:\Program Files (x86)\Flite\FluidFlow3\Preferences\[NAME]
3. Delete your .BAR & .LAY files.
4. Restart FluidFlow. Your menus should now be reset.