Wubi boot registry corrupted

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http://askubuntu.com – I was updating ubuntu 11.10 to 12.04 then something happened when i restarted my computer and ubuntu wasn't getting started after selecting ubuntu from boot menu So i tried to uninstall the ubuntu from windows remove programm but i got the error as shwon below. So i manually deleted the Ubuntu folder from C:/ubuntu after that i tried to install ubuntu again via wubi but i am getting the same error as shown below. someone Please help me i need ubuntu from my Rails development but i don't want to loose my windows 7. I would really appreciate if there is any help. ERROR -> Exception: Error ex (HowTos)