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USB001 not present in 'Add Printer' port list?

USB001 not present in 'Add Printer' port list?
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Just upgraded from XP to Win 7 Home Premium (32 bit).
When I try to install my Epson DX4400 multi function printer on USB, Windows plays a sound but does not attempt to load any drivers. When I try to add the printer manually, there are no USB ports available in the available ports list.
I have other USB devices (mouse/keyboard) working fine but cannot install the printer.
I have downloaded the latest driver from Epson but the install routine always hangs when it tries to auto detect the usb printer (there is a note about this on the Epson website but it only suggests cancelling the installation and adding the printer manually so I'm back to square one!).
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