After Installation of Ubuntu 12.04 inside windows No Option To Select Windows or Ubuntu?? i installed Ubuntu 12.04 from usb inside windows and when i restart pc no option to select Windows or Ubuntu ?
Which version of windows do you use? Did you use Wubi, since wubi only give Windows bootloader. But if you installed logging from USB, GRUB will be your bootloader. And you should not format the whole disk. That might have got the issue. Their might be many reasons for this issue. Recently Windows are coming up with UEFI which blocks other OS and some apps to be installed which aren't licensed. Sometimes Windows 7 got this issue. Read the following articles, probably you might come up with where you gone wrong
Best thing to do is Reboot using your usb, and follow this http://mygeekopinions.blogspot.in/2011/06/install-boot-repair-in-ubuntu-1104.html