A modem like that should have a reset button on it. Read in the manual, but usually you press and hold the button for 10 seconds and it's reset to factory defaults. However, I don't know for sure how that particular modem/router works...
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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