<Cannot use the driver though the driver is installed>
Windows XP/2000 place a limitation on the number of MIDI and audio devices that can be installed. Even changes from one USB connector to another are counted.
If this limitation is exceeded, you cannot use the device even if it is installed. This is due to the limitations of the OS and is not the problem of the driver.
In this case, you may be able to achieve normal operation by uninstalling the MIDI/Audio drivers, then installing them again.
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