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Boston 735 USB speakers with Realtek AC97
Step 1 - locate and save file 7507807.exe or search for the "BA735 USB" driver which contains all the Boston Human Interface Device drivers. Run the file and save the files somewhere useful and easy to find on your PC.
Step 2 - go to Device & Printers; right mouse click your PC's icon and choose Device Installation settings. Choose No and Never .... I like to call this turn off the MS knows best switch. Save changes etc.
Step 3 - Install the BA735 USB speakers to the USB port you intend to leave it on.
Step 4 - W7 should now try to load the driver. Because I didn't do in this order not sure of how this works, but make sure W7 goes to the %\7507807\CABS\WIN2KINF folder and you should see the BAUSBHID.inf driver file. Install this one and none other. If all works the HID entry in Device Manager WILL say "Boston Human Interface Device". You may hahve to reboot after this.
Step 4B (how I got it to work) was to Select the first "USB input Device" from the Device manager HID section. Then choose which driver to install as in the steps above. It must be from the WIN2KINF folder.
Step 5 - In the "Sound" option in control panel make sure the Boston USB AUdio Device is set as the Default Device. Have something playing to test it out, I still had speaker connected directly to the sound card and this just swapped the sound from them to the Boston ones. Voila!
A similar process to this will get these same speaker working in XP.
Good Luck.