> I'm having a problem with the A/D convertor in the chip

I've compared your code to a couple of working examples
and it appears OK, unless I missed something. So......

Are you sure the PIC is running ? ie, RC selected in CONFIG,
MCLR at 5V, that sort of thing

Are Ports B & D, which you're measuring, set as o/p ?

============================================

BTW, code is a lot easier to read if you can use macros. For
example, the macro name saves a lot of eye-flicking between
code and comments, saves time writing and wading through BCF
and BSF on STATUS is hard going. Note that indiscriminate macro
usage may bloat code too much (because the macro code is
compiled in-line) and CALLs might be more appropriate in some
situations, especially large macros that would be better as sub-
routines

Olin has a user-friendly system for eg register selection too

bank0 macro
         bcf     status,rp0
         bcf     status,rp1
         bcf     status,irp
         endm

bank1   macro
         bsf     status,rp0
         bcf     status,rp1
         bcf     status,irp
         endm

adch0  macro
         bcf    adcon0,chs0
         bcf    adcon0,chs1
         bcf    adcon0,chs2
         endm

delay macro
         clrf   temp
         incfsz temp,f
         goto   $-1
         endm

which are used in code as

         delay
         adch0                  ;select A/D channel 0
         bsf     adcon0,go_done ;start conversion
         nop

         btfsc   adcon0,go_done
         goto    $-1

         movf    adresh,w
         movwf   hi
         bank1
         movf    adresl,w
         bank0
         movwf   lo

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