Dual boot ubuntu 12.10 and windows 8 Dell Inspiron 15 r

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http://askubuntu.com – I purchased a new Dell 15R laptop which came with pre installed windows 8 64 bit and ueifi boot. I made a ubuntu 12.10 dvd and loaded it. When i started installing my installer could not recognise any other windows 8 or any other OS installed. When i moved to advanced partition tool, i could see my free space, my windows partitions. But i did not proceed. can anyone help. (HowTos)