[lubuntu] Difficulty installing ubuntu 12.04 on new Windows 7 laptop

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http://ubuntuforums.org – I'm installing ubuntu on my new HP laptop which already has Windows 7. I've got Ubuntu 12.04 on a DVD. I want to install it in the best way and assume that is with a dual boot using a dedicated partition. So I choose the "Something else" option after install. (I tried the install in windows before but that doesnt work plus I don't think I want it installed within windows). I get to the screen where it lists the partitions. I have dev/sda1 ntfs dev/sda2 ntfs dev/sda3 ntfs dev/sda4 fat32 (there is no free space) What do I do now? Tom (Hardware)