[ubuntu] Installer won't recognize already existing partition

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http://ubuntuforums.org – Hi, I'm having some problems installing 12.04 desktop on my asus k53sv laptop. I have a 500gb disk which has a 150gb partition containing windows 7, which I've been using for some time. The rest of the disk should be empty space with no partitions (I left it like that some weeks ago when I installed windows, so I could install linux now). When I try to install ubuntu from a usb stick, it boots in live mode and works perfectly, but the installer shows the disk as if it was totally empty and without partitions. I've had some distros installed in this disk some time ago (including ubuntu) and (Hardware)