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If you want to try doing a hard reset to see if it will fix your problems, you need to be aware that all your settings and data will be lost. You can do a hard reset by pressing and holding the power button while pressing the reset button on the back or side. That should do the trick, though I don't have an iPAQ 4150 in front of me to test that on.
In terms of the OS, everything is on ROM, a small chip inside the Pocket PC that has everything on it that you saw when you first turned on the device after buying it.
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