I have a 500GB hard disk. And I currently have a C: drive containing 80GB, a D: containing 280GB, and a system reserved drive with 349MB. I have free space of 104gb approximately which I emptied for installing ubuntu. When I live boot using my usb ubuntu detects my C and D drive and I think it added the free space with my D drive which appears as 301GB from ubuntu live, and gparted shows free space only 1MB! Gparted does not show any used or free space of any partition which I have. It shows a red alert sign on all the partitions. PLease help me with this I cannot install ubuntu now except for using the windows installer and I don't see install anongside windows 7 option in the setup.