Help with Partitions (Fedora 18)

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http://forums.fedoraforum.org – I am installing fedora 18 from live CD. When I manually create partition, and create the /boot partition of 500MB, I get the error message: "Unable to allocate aligned partition" However, I am successfully able to create swap and /home and / partitions with no error. I have more than enough space available for all partitons. And when I click on "Automatically create partitions" under manual partitioning scheme, it creates the all the partitions i.e. /boot, / , /home and swap with no errors. I have attached all the screenshots of my partitioning step. Also (HowTos)