You can install most hardware or mobile devices just by plugging them into your computer. Windows will automatically install the appropriate driver if it's available. If it's not, Windows will prompt you to insert a software disc that may have come with your hardware device.
To install a USB device:
1. Some USB devices have power switches you should turn on before connecting them. If your device uses a power cord, connect the device to a power source. Then, turn it on before connecting it.
2. Next, decide which USB port to connect your device to. If your computer has USB ports on the front, consider using one of those if you plan to frequently connect and disconnect the device. (You can use any port the next time you plug in the device.)
3. Plug the device into the USB port. If Windows can find and install the device driver automatically, you'll be notified that the device is ready to use. Otherwise, you'll be prompted to insert a disc containing the driver.
After installation is complete, check the information that came with your device to see if you need to install any additional software.
Occasionally, a USB device isn't recognized by Windows and doesn't come with a disc containing a driver. In that case, you can try to find a device driver online. Start by checking the website of the device manufacturer—you can often download drivers from the "Support" section of such sites.
For more information about installing different types of hardware, see Installing new hardware: recommended links.
(http://windows.microsoft.com/en-US/Windows7/Installing-new-hardware-recommended-links)