Bootcamp partition not showing at startup

Hey guys,
I upgraded my macbook pro to Lion last week and now I can't install Windows on my computer with Bootcamp. I can still partition through Bootcamp assistant, and in Finder it shows the Bootcamp device. However, when I try to install Windows by holding Option during startup, the Bootcamp disk is not showing up. There are only three options: Mac, Recovery, and Windows (disk). If I choose the Windows disk, it tells me there's no bootable device.
Also, in Startup Disk in System Preference there's no Bootcamp option.
Is the Recovery Disk screwing it up? Can anyone help me please?
Thanks.

Solved.
I just installed clean BOOTCAMP using Bootcamp Assiastent, that causes windows data loss.
Anyway, after formating bootcamp, i found a solution.
get  iPartition and mark bootcamp partition "show in windows" option.
i regret reinstalling windows

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