See https://musescore.org/en/node/96811 for suggestions. If they don't help, please ask for further assistance on the Support forum, and give more info like what version of MuseScore, what OS, what audio hardware you are using, whether they are selected in Edit / Preferences / I/O, and whether the device drivers are 32 or 64 bit.
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See https://musescore.org/en/node/96811 for suggestions. If they don't help, please ask for further assistance on the Support forum, and give more info like what version of MuseScore, what OS, what audio hardware you are using, whether they are selected in Edit / Preferences / I/O, and whether the device drivers are 32 or 64 bit.