Most new users find it difficult to get the USB drivers. Because Arduino Uno (SMD Edition) does not use the same driver chip with Arduino Uno R3 (DIP Edition). But don’t worry, High Technology Electronics (HTE) have provided two drivers.
Use the USB / Serial CH340 / CH341 Driver‘s Download:
Windows 32 bit : Download
Windows 64 bit : Download
Linux : Download
MAC : Download
USB Serial Driver CH 340 can be used for Windows XP / Win 7 / Wind 8. I try to use Windows 8.
If USB Serial Drivers are successful it will be visible in the Devices Manager of Windows