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For PHD: the communication between PHD and the mount may be being blocked by the firewall...see if you can disable the firewall and try again.
for the QHY9: as supernova1965 mentioned, permissions may be an issue. It could be that you no longer have the right to install hardware, although, since you have used the QHY9 before the drivers should be loaded already. Have a look in Device manager and se if there are any Unknown Devices, one of which may be the QHY9.
since it is school equipment their helpdesk/IT support should help.
anyway, just a couple of ideas.
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