After some investigation, I decided to use VirtualBox as I trusted it a bit more than Cooperative Linux. Here's the super-short guide to getting VirtualBox setup to access raw partitions using your current install of Linux. With only minor modifications, you can create a new VM that access existing physical partitions:
(1) Create a virtual disk that's nothing more than a reference to your existing file systems using VBoxManage:
# Note, backslashes immediately before new lines are continuations
C:\Users\kpederson\.VirtualBox\HardDisks>"\Program Files\Oracle\VirtualBox\VBoxManage" \
internalcommands createrawvmdk -filename rawdisk.vmdk -rawdisk \\.\PhysicalDrive0 \
-partitions 5,6,7,8 -mbr f:\sda5_mbr -register
(2) Create a virtual machine that uses the virtual disk created in step 1. In the above command I called it
(3) Configure your virtual machine using VirtualBox's bridged networking. In my case, I found it buggy, so I setup my virtual machine to use host-only networking and then used Windows to bridge the host-only network adapter with my real (i.e. physical) network adapter.
(4) Configure a share in samba:
comment = Shared Documents
path = /home/shared
guest ok = no
writable = yes
And with samba up and running, I had access to all the files I needed. In addition, I can use ssh/sftp to access all the files using WinSCP or a similar file-transfer client.
Full details are available on a blog post I wrote entitled "Accessing Linux File Systems from within Windows"