from what i've read so far it sounds to me that you're trying to full install to a usb stick which slax live doesn't like and it will kernel panic and or corrupt the data, so follow this step by step and all should be fine* (i am now at this point assuming you have a windows and a linux machine, or at least a windows machince otherwise there is now justification for you using the bootinst.bat file whatsoever)
1- using your windows machine, format your usb stick, this should by default put it into an acceptable vfat format
2- reboot into linux (as i've found this just works faster) either with whatever linux machine you have or the BT3F dvd you said works with no errors
3- fdisk /dev/"whatever device your flashdrive is not including the number, ie. /dev/sda1 =fdisk /dev/sda"
4- print the partition list by typing in "p" if the flash drive is bootable then there will be a "*" in the bootable field if not the type "a" and select partition number 1
5- write changes to MBR by typing "w" *note a reboot may be needed after this step
6- copy your /boot and /BT3 directories over to the flash drive from wherever they are located(if you only have the .iso then you will need to un-pack it do this by mounting the iso "mount -o loop -t iso9660 file.iso /mnt/test" as an example)
7-IN A TERMINAL WINDOW!! cd into the /boot folder that you just copied over to your flashdrive and type "sh bootinst.sh
8-follow the on screen directions and the reboot your eeepc
9- at the bios screen press the "esc" key and select to boot from you flash drive
10-if BT3 fails to run you did not follow these instructions properly and i will not help you anymore




