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Can I overload my netbook if I use a charger with a higher wattage than the one indicated for my netbook. I know that the charger has a protection in case of an overload. But what if, for example, the wattage rises and the protection stops at 65 watt. But my netbook can only take 25?

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No, Wattage is not a issue. Wattage (power) is determined by the voltage and the amperage (think "pressure" and "flow"). If you have the correct voltage, then normally every laptop will be pulling less than the maximum wattage from the the power supply.

If a laptop or any device tries to pull more amperage than the rated power supply can deliver, then bad things happen: the power supply will overheat, fuses might blow, the voltage will go below the rated amount.

However, the opposite case of a laptop or a device pulling less amperage (and thus less watts) is a good thing.

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Also, adaptors tend to be most efficient at or around their rated wattage. And another important factor when using some other charger is the polarity of the plug - this could damage your laptop if it's incorrect. It's normally indicated, and the symbol on the laptop and charger must match. –  Bob Apr 15 '12 at 11:59
    
You wouldn't want to use a charger that's rated for something like 10x the current/wattage of the original one, as the voltage regulation might be poor at the relatively low currents being drawn. But only a 2-3x difference in current/wattage is fine. (Voltage and polarity must match, of course.) –  Daniel R Hicks Apr 15 '12 at 13:17
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