[FDE] Simple question (newbie)

[David]

Hi all - simple question, hope this is the right place:

Best _free_ product for full disk transparent encryption with windows xp:

What I'm looking for:
  Works with windows xp, does not cost money
  Good algorithms (AES-256, SHA-512, tiger...)
  Full disk/boot partition capable (not "container-based" like truecrypt)
  Open source and well-tested a bonus

What's the best software out there?  The closest I've found is Compu-sec.  Is
that any good?

Thanks,
David