This is what I use when on a Linux box and do not have the "paths" set.
Code:
cd /home/shop/MAC/PIC\ LINUX/SweepBot
wine c:/pbp/pbpw -e -s -ac:/Program\ Files/Microchip/MPASM\ Suite/MPASMWIN -p16f676 z:/home/shop/MAC/PIC\ LINUX/SweepBot/SB1.bas
wine c:/Program\ Files/Microchip/MPASM\ Suite/mpasmwin /e /l SB1.asm
Basically what happen is PIC BASIC does it's thing by making an ASM file per MPASM's standards, and then MPASM runs to convert the ASM to HEX.

Should work on windows too...Once you get rid of the "wine" and fix up the "/ \ / \ / \"