Hello and welcome to LQ!
First you have to check wich partition is your FAT32. For this you have to be root and run fdisk:
look for the one that contain vfat. It shoud look like hdax
where x is a number. Also it can be hdb1...
Next you have to create a directory where to mount it:
Now mount it with:
mount -t vfat /dev/hda1 /mnt/win_C
To have the partition mounted on each boot, you have to edit your /etc/fstab file. Insert:
/dev/hda1 /mnt/win_C vfat noauto,user 0 0
To have write permission as normal user on the Win-partition use this instead:
/dev/hda1 /mnt/win_C vfat umask=000,iocharset=iso8859-1,codepage=850,users 0 0
PS: For this use a terminal [console]