When you tried to install Ubuntu, it's possible that your Bootmgr was corrupted. Try the repair install of windows as rolli59 suggested.
Yeah,exactly I applied the same many a times.Actually Windows was crashed ,I don't know how
But Good thing that happened to me is after so many efforts,I got success in installing Ubuntu,It was booted itself.
It took three to four days resolving it
And now Linux is running on my PC successfully
Thanks for help