Edit this DWORD registry key:
More info MS KB102988[HKEY_LOCAL_MACHINE \SYSTEM \CurrentControlSet \Services \ PORT-TYPE-X]
NumberOfButtons=3
PORT-TYPE-X should be exchanged with the type of mouse connection: "BUSMOUSE", "SERMOUSE", or "i8042PRT" (PS/2).
More info MS KB102989
More info MS KB102990
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