I don't know what can be causing your issue re: mounting FAT32, I can
only tell you my own experience. I have 2 dual boot systems, one Wubi
and one standard. On the Wubi system I find the original Windows
install in a folder /host; in the regular dual boot it depends on the
name of the partition, in my case "OS_install". You must have one or
the other if it is dual boot, even if it is an NTFS partition.