Yes you can do.
First turnoff your iphone and the
Sleep/Wake button for a few second until the red slide bar appears then slide it. If your itune is already off then you can skip this step. Now press the home button for 10 seconds until you see the “please connect to itune” icon.
Connect it to your PC and release the button. Open the itune and it will now show a message
iTunes has detected an iPhone in recovery mode. Click
O.K. will take you to iphone pane there you click at restore and let it restore completely.