[ubuntu] can hidden encryption make an os unable to boot?

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http://ubuntuforums.org – I have Ubuntu 10.04 and Win7 ultimate on their own partitions, roughly 50/50 of the HDD. I was considering using Truecrypt to encrypt the entire Windows partition. Thats easy enough. Where I'm concerned is I want to make it a hidden encrypted partition (why do it otherwise). Simply put, If I make it hidden will I still have the Windows 7 Loader in my boot menu? I don't want to make it hidden if it becomes inaccessible in the boot menu. I ask because on Truecrypt's website it says it is as if the OS doesn't exist. (Hardware)