Unable to see Ubuntu as a option during booting after installation of Win8

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http://unix.stackexchange.com – Earlier I had windows 7 and Ubuntu 12.04 and I use to get option during boot up to choose from both of them. But after installing win 8 in another drive I just see win 7 and win 8 as option. However I am Ubuntu installed hard drive still exists as I can't see Drive E in my computer from either of the windows OS.Can anyone please help me out with this. I have some important work to be completed using Ubuntu. Thanks a tonne in advance. (HowTos)