Okay, I'm going to ASSUME you're meaning reset to the default GraphicsGale palette.
Just have your Palette toolbar open.
See the little arrow on the left side, pointing down? Click it. A menu should pop up.
You'll get several options that look like this...
Copy RGB Value
Copy RGB Values
Paste RGB Value
--
Load Palette
Save Palette
Default Palette <--- (This is the one you want to click.)
--
Make Gradiation
blahblahblah
Click that button and ta-da. Reset to default.
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Oh, it's you.
[Omni, Seraphim, Idea, Returnity]