you can try any of these option:
1. remove it by running the CONFIGURATION CENTER in your desktop.
choose section MOUNT POINT, then delete the partition which have VFAT type, turn it to ext2 or ext3 or reiserfs, and finally format it.
2. otherwise, if you're more familiar with windows command, try to use fdisk.
choose to run windows in your boot loader screen, then press F8 key on the keyboard soonly after it to prevent you entering windows normal mode.
after you see the menu, select "safe command promp".
type "fdisk" on the shell, then delete any FAT or FAT32 partition, quit fdisk & reboot. enter linux, go to config center, & set the unused partition to ext3 or else then format it.
p.s. it's easier to use option number 1 anyway, hehe