Actually the central European power grid is now 230 Volts, 50 Hz.
Lived there for 2 years!
Depending on your current computer power supply, it may have a 115/230 Volt switch on the back or it might be a switching power supply that will auto detect the line Voltage. The auto detect switchers will work almost anywhere. Laptops almost always use auto detecting switchers.
If you decide to tear down the machine, never fear, the Dutch are very computer savy. You will have no problem finding at least one computer store in almost every town, probably more than one.
JamesO