Hi Seevali,
I would suggest you to create Windows 8/8.1 installation media. Refer the following link.
How to create installation media for a PC refresh or reset:
http://windows.microsoft.com/en-US/windows-8/create-reset-refresh-media
Follow these methods.
Method 1: Unplug all external devices, except keyboard and mouse, then try to boot the PC.
Method 2: Perform
Automatic repair from Windows Recovery Environment (Win RE).
To perform Automatic repair on Windows 8.1 computer follow these steps:
a)
Insert Windows 8.1 installation disk and restart the computer.
b) Press F12 key(typically this is F12, but it can differ between computer manufacturers) and choose the drive that you inserted the installation media into.
c)
Once the Windows Setup window appears, follow these steps:
d) Click on
Next and selectRepair your computer.
e)
You will then see a blue screen and an option to choose.
f)
Choose the optionTroubleshootand select
Advanced options.
g)
Choose Automatic Repair to restartfrom
Advanced boot option.
h)
Once restarted, choose an account with administrative privileges fromAutomatic repair window credentials of which you want to use to repair Windows 8.
i)
In the next screen, enter the appropriate password and hit theContinue button to initiate the Automatic repair process.
Method 3: If Automatic Repair fails, then perform System Restore,
a) Insert Windows 8.1 installation media and restart the computer.
b) Press
F12 key (typically this is F12, but it can differ between computer manufacturers) and choose the drive that you inserted the installation media into.
c) Once the Windows Setup window appears, follow these steps:
d) Click on
Next and select Repair your computer.
e)You will then see a blue screen and an option to choose.
f) Choose the option
Troubleshootand select Advanced options.
g)
Select Restore and follow the onscreen prompt.
For your reference: System Restore
Please follow the section “Restore your PC to an earlier point in time”
http://windows.microsoft.com/en-US/windows-8/restore-refresh-reset-pc
Let us know if it helps. If the issue persists, please reply, we will be glad to assist you further.