computer doesn't boot from usb ubuntu installer when trying to install it alongside windows 7

Posted by ali on Ask Ubuntu See other posts from Ask Ubuntu or by ali
Published on 2012-10-06T19:11:53Z Indexed on 2012/10/06 21:54 UTC
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dual-boot

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bios

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uefi

I'm very noob at linux and installing techniques. I want to install ubuntu 12.04 from bootable usb flash alongside windows 7 ( also tried live CD but now working ) but computer is not booting from usb flash or LIVE-CD and boots windows 7 ( acer aspire 4750g ). and of course I have set the bios priority in the right way.

There is one important point to tell that I have installed Fedora 16 on my laptop successfully and now I have it on my system. when I was trying to install fedora i got some error and searched about it and got this point that I should delete a .efi file and then installation went right.

In this case , what should I do to solve the problem? ( I also don't need my Fedora anymore )

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