Despite others, the installation shows "Install alongside Windows 7" option but when I select that option, it asks to remove the installation drive and close the tray if any and press Enter. After I press Enter, it restarts and opens Windows and when I put the CD-R again, it goes back to the option. What shall I do? I don't want to delete any files and Windows 7 but still want to try out Ubuntu 12.04 as I was a former user of Ubuntu 11.04 a year or so ago.