unable to install wubi on windows 7 home premium 64bit

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http://askubuntu.com – when i am trying to install wubi in a partition made on my hard disk iam getting a error message saying "could not retrive the required disk image file for furthur details goto the C:\Users\raghavadss\AppData\Local\Temp\wubi-12.04-rev269.log file" which i have pasted in pastebin.ubuntu.com following the link http://paste.ubuntu.com/1202911/... please do help me installing ubuntu thank you (HowTos)