To connect a Bluetooth speaker to a Windows 7 computer, first ensure that the computer has a Bluetooth receiver; if not, an AUX connection is necessary, but the user indicated that their Bluetooth G47 speaker does not support AUX. The speaker can be connected via USB, but it was clarified that the USB cable is only for charging purposes. The discussion emphasizes the need for Bluetooth functionality on the computer to establish a connection with the speaker. Summary generated by the language model.