Hi Amruta
I am Dave, I will help you with this.
That check disk is not going to complete, it should not take that length of time to complete.
Since that process is in stage 4, it is safe to stop that process, press and hold the Power Button on the case of your PC for 5 - 10 seconds to perform a hard shut down.
Wait a few seconds and start your PC again, does it boot into Windows normally?
if not, you mention you have tried booting form a USB and that was not successful, what exactly happened when you tried to boot form the USB, what was on the screen?