can't reprogram 12F615

[Max Power]

Hello,
I having a heck of a time reprogramming a board with a 12F615 on it. The first program will download and verify just fine. After that, there are errors in different program memory locations:
Address: 00000000 Expected Value: 00002851 Received Value: 00002810
Programming failed

I suspect that I need to use my pickit2 instead of my pickit3...but I've also tried an ICD2 and an ICD3. my pickit2 is back at home.

I read through this: (the 2nd post)
http://www.microchip.com/forums/m576596-print.aspx

and then I set my icsp data and clock pins to be inputs instead of outputs - I'm not using them for anything else, there is nothing connected to them except the programming header. Also, I put in the pause command early in the program.

I figured that had to be what was going on.. programmed a new chip with the modified code...but I still can't reprogram

here is the program. I've got a thermistor voltage divider coming into GP2 and I've got GP4 controlling a fet acting as a low side switch. 10K pullup on MCLR, and the 5 pin programming header, and thats it.

 @	__CONFIG _CP_OFF & _WDT_OFF & _BOR_OFF & _MCLRE_ON & _PWRTE_OFF & _INTRC_OSC_NOCLKOUT & _IOSCFS_4MHZ 

'CLEARWDT						'picbasic will insert watchdog clears throughout the program

'    Hardware configuration
'    ======================
PAUSE 1000

DEFINE OSC 4					'tell picbasic how fast the clock is

DEFINE ADC_BITS 10 				' Set number of bits in result (8, 10 or 12)
DEFINE ADC_CLOCK 3 				' Set clock source (rc =3)
DEFINE ADC_SAMPLEUS 50 			' Set sampling

ADCON0 = %10001000				'RIGHT JUSTIFIED, VDD reference
ANSEL  = %00000100				'GP2 is analog



GPIO = 0						'pins are set low, BEFORE assigning output pins to be outputs

TRISIO.0= 1   '0 = output		'GPIO.0 = PIN7	(icsp DATA)
TRISIO.1= 1						'GPIO.1 = PIN6  (ICSP CLOCK)
TRISIO.2= 1              		'GPIO.2 = PIN5   analog input
TRISIO.3= 1   'GP3 = input only	'GPIO.3 = PIN4
TRISIO.4= 0                 	'GPIO.4 = PIN3  
TRISIO.5= 0                   	'GPIO.5 = PIN2  
	


POWERSWITCH VAR GPIO.4

TESTLED VAR GPIO.5

ADvalue VAR WORD


Main:

ADCIN 2, ADvalue

IF ADvalue > 275 THEN

	POWERSWITCH = 0
	pause 200

	POWERSWITCH = 1
	pause 75

ELSE

	POWERSWITCH = 1

ENDIF

goto Main						'loop back up to main
    
END