Error installing Ubuntu

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http://askubuntu.com – I am having problem in installing ubuntu in my windows 7. I had installed it earlier using Wubi but it got corrupted and now because of it i am not able to install any of the ubuntu version in Windows 7 via wubi. Someone please help me it is really getting frustrating. This is the error i have got Exception: Error executing command command=C:\Windows\sysnative\bcdedit.exe /create /d Ubuntu /application bootsector retval=1 stderr=The boot configuration data store could not be opened. The configuration registry database is corrupt. Is there any way which will make my windows boot clean and re (HowTos)