Mac HD Volume no longer visible in Windows

Haven't done anything significant to change anything on either partition, just randomly today booted into Windows 7 and it can't see my Macintosh HD partition.
This wouldn't be a problem if I could hand the Windows partition files from the OSX side, but that's never been possible as far as I can tell.
Slightly unrelated (maybe), but also kind of weird are two things:
my start-up/sign-in screen in OSX has completely changed...it used to be the icons against a dark grey mesh background, and when I chose my account the icon and field would slide to the center and once I input the password, it would start up. Now they're much larger against a blank grey background and the password input field is highlighted in blue and has a weird icon. Additionally, my computer now asks for the system password whenever I wake it from sleep. It never did before and I haven't changed any settings at all.
Anyone have any idea what could be going on, for either of these? Any help would be appreciated.
Running Lion on a late-2011 MBP.

Figured out the login screen issue - FileVault had somehow turned itself on.
Boot Camp still doesn't show the Mac volume.

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