Flexi Swatch
Get out your install disk and find a file called default.swt, copy this to
C:\Program Files\FlexiSIGN-PRO 7.6v2\Swatch\Table, replacing the old (corrupted) one. This will work, but any of your old colors created and saved to your personal swatch table will be gone. Perhaps you could rename your original before copying the new one over, and possibly recovering it at a future date.