Ok, I see there's 2 places where I could be 'tripping' !

1st tripping - by that I mean the point where the ADCIN routine distinguishes between the light and dark area of the disc.

2nd tripping - Do you see this phrase anywhere in the manual?
Code:
ADCON0.2 = 1 			'Start Conversion
I.E. YOU don't need to start the A/D conversion, ADCIN does that for you.