[ubuntu] Grub won't load on multiboot system

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http://ubuntuforums.org – Hi all new to Linux and having a dabble. My problem is this I have a multi boot machine Windows 8,7 and XP all on different drives and have installed Ubuntu 13.04 which caused my machine not to boot it just went to the grub rescue command. I ran the boot repair start up disc which didn't fix the fault but gave me this pastebin entry http://paste.ubuntu.com/5681100/ I have managed to get my machine running again using the windows 8 fixmbr but would still like to run Ubuntu to learn how to use it. Any help greatly appreciated :D (Hardware)