1. and nope you're not using PBP, it's PDS proton
  2. this device have no PORTa
    This device have some multiplexed stuff on almost all pin which have to be disabled first (ADCs and analog comparator)
  3. you have to set the configuration fuses somewhere in your code. if my memory serves me well, PicKit 1 don't allow to change them on the fly.

now try
Code:
Device = 12F675
    '        Device programming mode and hardware definition 
    '        ===============================================
             ' Using Internal Clock, no clock out
             ' Disable Watch dog timer
             ' Disable MCLR pin   
             ' Enable Power-up timer
             ' Enable Brown-out detect
             '
Config INTRC_OSC_NOCLKOUT,_
       WDT_OFF,_
       MCLRE_OFF,_
       PWRTE_ON,_
       BODEN_ON
             '
             '
TRISIO = 0
CMCON=7	        ' Disable analog comparator
ANSEL=0	        ' Disable analog converter

Start:
      High GPIO.5
      High GPIO.4
      DelayMS 500
      Low GPIO.4
      Low GPIO.5
      DelayMS 500
      GoTo Start
The right forum for you will be
www.picbasic.org/forum