You can definitely follow the steps mentioned in This Official Link. But in my windows 7 PC it didn't work. Upon plugging in the Arduino UNO board the The entry "Look under Ports (COM & LPT). You should see an open port named Arduino UNO (COMxx)" never came under Ports (COM & LPT). So I am stuck in the middle of nowhere.
1. Download the Arduino IDE and device drivers package from this link.
2. Go to Start Menu > Control Panel > System And Security > System > Device Manager.
3. Under Device Manager Expand Other Devices.
4. There should be one or many Unknown Device entries.
Right click the first one of them and select Update Driver Software. Repeate the following steps for all of them untill you meet success :).
5. Click on "Browse my computer for driver software"
6. Browse to the folder you downloaded and unzipped (if downloaded a zipped archive) . there should be folder called "Drivers". Don't forget to check off Include Sub folders option.
Now click on Next. The driver should be installed without much drama.
Verify that the driver has been successfully installed. There should be an entry for your arduino model under Ports (COM & LPTT)
Final Step. Don't forget to set the correct COM port in Arduino IDE. As shown in the above step.
