http://tinyurl.com/2awwsz
Open th Computer Management go to Device Management and at the USB open this up and right click on the first entry scroll down to the Update Drivers and left click on that. Then point the Update Drive installer to where you have saved the Downloaded Drivers and allow the system to install the drivers for the USB Ports.
With external HDD they should have 2 USB Plugs on the computer end of the lead and you need to plug both of these in to a NB to get enough power to the External HDD to allow it to run. If you don't have enough USB Ports available use a Powered USB Hub which will remove some of the power drain from the NB and allow you to manage to do more with less of a power drain on the NB.
With USB External HDD the only software that is necessary to install is the software that comes with some caddies which allow a complete backup and Encryption or Password Protection. Nothing else should be needed if the devices are working properly as they should be auto detected and just be there to write Data to when required.
Though this depends on some devices which have more advanced security they will need software installed to allow you to copy or read things off the units as they have their own security in place. The software required here comes with the devices and should be installed before attaching the USB Devices.
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