More to try

1)Turn the Comparators OFF to get PORTA to work as intended

2)
Code:
TRISA = %11111111
You set all of PORTA inputs here but make them outputs in your code

3)
Code:
TRISB = %11000000 'portb.6 and .7 out puts all others in put
You got the comment backwards (0=output, 1 = Input)

4)Remember RA4 is open drain so it needs a pullup on your real circuit

5)
Oh, and it it were me, I would start with this and make this work with the Simulator
Code:
TRISB=1
MAIN:
IF PORTB.0 = 1 then
	PORTB.1=1
ELSE
	PORTB.1=0
ENDIF
GOTO MAIN
Post back after you try some of these