Hey varunsn. Unfortunatelly, if you've damaged the recovery partition, there's not much you can do about it. If you have a Windows 8 installation disk, then I'd recommend that you do a backup of your most important data and make a fresh install of Windows. If on the other hand your Windows is OEM (pre-installed when you bought the laptop), then I'd recommend that you contact Microsoft customer support and inquire about the issue.
Hope that helps.
Boogieman_WD