You mean you are able to run Elementary live but not install it ? Does it happen right after you click the install icon in live mode ?
Else it could be a result of you choosing the advanced partitioner during install and not paying attention to where it installs the bootloader.
If you want to boot from the harddrive the bootloader would normally need to be on /dev/sda.
Screenshot from 2013-08-29 20_06_05.png
Do yo have windows too ? There is a comprehensive guide on the ubuntu wiki on WindowsDualBoot
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