Depends on file system, but with a live CD you can mount drives. If the Windows f/s is FAT then it will mount read & write no problems but, (keep in mind im a freebsd user) I think NTFS has some write issues, but maybe in Linux they dont exist. I do know however that in Linux NTFS support must be compiled into the kernel.. That could be a drawback unless you are able to setup NTFS support some other way.
mkdir /mnt/win; mount -t ntfs /dev/hda1 /mnt/win
Maybe that will work
(Substitute hda1 for the Windows partition, RTM for disk naming conventions.
Hope that helps.