Installation Problem

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http://askubuntu.com – I recently installed Ubuntu 12.04 alongside Windows 7 in my laptop, I have experienced a few problems after my installation however. Firstly when I restart my computer I am not presented with the option to run Ubuntu, it just goes straight into running Windows. Secondly my hard-drive is partitioned into two, C and D, Windows is installed on C and Ubuntu got installed on D. Lastly whenever I want to run Ubuntu I have to insert the USB I used to install Ubuntu with, restart the laptop, press F12 for boot options and select the USB for me to be able to run Ubuntu, after this I can remove the USB (HowTos)