How to remove WUBI installed Ubuntu without affecting Windows files? [closed]

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http://askubuntu.com – Possible Duplicate: How do I uninstall Ubuntu Wubi? I have Windows 7 in my laptop with that I have installed Ubuntu 11.04 using WUBI with partition. Now I want to remove Ubuntu from my laptop without affecting my Windows files and data. Is there any effective way to do this? (HowTos)