wubi boot problem

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http://askubuntu.com – Please tell me how to uninstall it without effecting windows 7. I tried wubi but it didn't start up after the first boot up. On the second boot up option came up to select Ubuntu or windows 7. I choose Ubuntu but only logo appeared and then after that blank black screen nothing else. So i uninstalled wubi. Tell me the reason?? My processor is Intel i3 64bit but wubi went to download for amd 64bit. Did it created the problem? (HowTos)