You shouldn't even need the mounters - it should all be done for you automatically, including popping up the Thunar file manager, if you have HAL loaded and working (did you choose VL-HOT or HAL during the install? If the latter you should get an icon on your screen for the drive. If the former file manager should pop up). Before we consider to be what I think are redundant applications (the Puppy mounters), you should try HAL first:
Menu, System, VASM, SUPER, HARDWARE, MOUNTER, choose HAL, reboot.