Unable to install Red Hat Enterprize 5.2 in DELL laptop

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http://www.ozzu.com – Hi guyscan any one tell me where i am wrong.I have DELL studio laptop with 6GB Ram and 500HDD. For installing Linux i left 50GB unformated partition in my system. First i installed windows7 professional. Than 2ndly when i try to install Linux i get error.I tried several combination and most of the time i get same error. "NOT ENOUGH SPACE". It is not allowing me to create any swap partition or ext partition. Than i processed with the "use free space option", i got error that "NO SWAP PARTITION FOUND".can any one guide how t (HowTos)