How to simulate adc in proteus?

I am doing a project to receive a sensor output in a pic 18f4520. And then the sensor output will be available on port. Then it is displayed on a 7 segment display. How to simulate this on proteus?

it have small play button on left bottom corner..

I got the following error... Don't know what to do..
Pls help...

SIMULATION LOG
==============
Design: C:\Users\Ashu\Desktop\proteus\PIC_7Seg.DSN
Doc. no.: <NONE>
Revision: <NONE>
Author: <NONE>
Created: 22/02/11
Modified: 18/03/11

Compiling source files...
Build completed OK.
Compiling netlist...
Linking netlist...
Partition analysis...

Simulating partition 1 [17448C66]...
PROSPICE Release 6.9 SP5 (C) Labcenter Electronics 1993-2006.
SPICE Kernel Version 3f5. (C) Berkeley University ERL.

Reading netlist...
Reading SPICE models...
Building circuit...
Instantiating SPICE models...
[U1] PIC16 model release 6.9 SP0 simulating PIC16877 device.
[U1] Loaded 256 bytes of persistent EEPROM data.
[U1] Loading HEX file 'Seventh.hex'.
[U1] Read total of 4432 bytes from file 'Seventh.hex'.
[U1] Loaded 2216 program words and 0 data bytes.
PROSPICE - Internal Exception: access violation in module '<UNKNOWN>'.
Totaliters=0, Totalsteps=2, Goodsteps=1, Badsteps=0


Real Time Simulation FAILED.

the project file is attached below:

pic 18f4520 or PIC16877?? which that u use?

Ooops.. sorry... I replaced it...
Now no output is coming in the 7 segments...
The new project files are attached below..

actually im at class..i cant open your file because here i dont have proteus..ill check later..

nothing wrong with that..just put vcc to mclr.. look at this picture..