Unable to dual boot windows 7,8, and ubuntu using w8 bootloader

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http://askubuntu.com – I had a sony vaio running windows 7 and Ubuntu but I had given it to my friend as he needed it, I bought a new desktop with windows 7 and windows 8 dual booted using w8 boot loader, Now I am trying to boot Ubuntu but I want to boot it from windows 8 boot loader can anyone please help so I can boot all 3 oses from same boot screen.Please help, thank you. (HowTos)