Not able to get Win8 or Ubuntu after installing ubuntu 12.04 using wubi in Winsows8

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http://askubuntu.com – I had Win8 RC installed in my laptop and then installed ubuntu using wubi. Now when the system boots i dont get the option asking for going to UBUNTU or WINDOWS .Its directly going to Windows and even that is not starting up . I get the new blue screen of death and then its boots up again with the windows logo saying 'program recovery started'/ Plz help (HowTos)