Encrypting a Dual Operating System with GRUB boot

I have a laptop with GRUB boot on it that has Fedora and Windows XP.  I was told that the grub boot is installed on a seperate partition than windows and fedora.  Its on a 512mb boot partition.  So I want to encrypt my windows xp partition, and when I use TrueCrypt, I go to select Multi-boot and it says that I can't do this.  If I select Single-boot instead, will this effect the grub boot manager?
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cmb991Asked:
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gtkfreakCommented:
When you install Fedora (12) it asks if you want to encrypt your Fedora partitions. Go ahead and use that. However, it could mean that you may need to re-install Fedora once more.

For Windows XP encryption, you could use Volume or Container encryption. You can move your data to a different partition in Windows and use Volume encryption or you could move it to a truecrypt container file in any partition on your Windows system.
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cmb991Author Commented:
I already have fedora installed, is there any way to encrypt it without reinstalling it?

For windows xp, can I just use TrueCrypt and select single-boot?
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gtkfreakCommented:
http://docs.fedoraproject.org/install-guide/f12/en-US/html/apcs04.html
This is the install guide. Take a backup before trying any of these.
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rmttCommented:
Truecrypt is the best solution. You can encrypt it easily without re-installing.
http://www.truecrypt.org

Have a read through the Beginners section at the Documents link.
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