[ubuntu] Ubuntu 12.04 on Compaq can't see Windows 7 during installation

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http://ubuntuforums.org – Hi I'm trying to install Ubuntu 12.04 on a Compaq machine CQ290EA. I have created a Ubuntu DVD and can get the installation to start by setting the Secure Boot Configuration to Legacy. I have also disabled Secure Boot and Fast Boot. The installation proceeds but then tells me that no operating systems have been detected during the installation. However, Windows 7 Ultimate is on the machine and I don't want to overwrite it i.e. I want Windows and Ubuntu on the system. Can anybody tell me what I've done wrong? Thanks in advance Dave (Hardware)