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How to install ubuntu along with windows 7

I have  HP 15-r062TU. In that i  am install windows 7 64bit os. Now i would like to install ubuntu 12.04 or 14.04  LTS os along side windows 7.
For first booting from usb/cd-rom it shows along side with windows after hitting continue button it reboots from the begin and  starts all stages and shows without alongside with windows option during installation.
Please help me. Thanks in advance.
I made a mistake that  i was completely removed ubuntu operating system includeing HP_Tool hard disk partion also from pre installed ubuntu os.
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