error pbp and mplab id

i install mplab ide ver 8 and pic basic pro 2,47.i am receiving and following error when i try to compile:"
Executing: "C:\PBP\PBPW.EXE" -ampasmwin -oq -z -p16F876 "BLINK.BAS"
PICBASIC PRO(TM) Compiler 2.47, (c) 1998, 2006 microEngineering Labs, Inc.
All Rights Reserved.

ERROR: Unable to execute mpasmwin.Halting build on first failure as requested.
BUILD FAILED: Thu May 08 13:44:59 2008

"
This means that can't find the asm compiler of microchip but i can't find solution.everything is on default folders.what can i do?

thanks

Have you followed the instructions here?
http://www.melabs.com/support/mplab.htm

oups.i forgot to change the path variable.i did it and work ok now without errors.
thanks mackrackit for your reply.

regards