pat no.5161AS

it is common anode

But my friend what about your current schematic. The 5161AS is a single digit seven segment LED display. So how do you wire up your circuit. A pencil drawing will do fine. But we badly need a schematic here
I also I suspect the 4 digit LED display used on the project. Is some sort of virtual component. Connecting a real LED display that way will never work in the real world. That is the problem with Proteus projects

 

1,2,17,18 / 6,7,8,9,10,11,12 pins are from the PIC

 

No it can not be done that way at all. You must do like this as an example http://webspace.webring.com/people/wt/teststests/pic6.htm

 

pat no.5161AS

it is common anode

Good... That helps a lot... Until now, I thought you were saying you had common cathode displays, which should have worked.

You will need to modify the program to make it work with common anode displays. It may take a while, but let me take a closer look at the program for you. Basically, you need to change the "active high" segment lines to "active low", and you need to change the "active low" column/digit lines to "active high".

Cheerful regards, Mike

 

The OP say he use 5161AS. According to this datasheet http://pdf1.alldatasheet.com/datasheet-pdf/view/96548/ETC/TOS5161.html
The letter A is used for Common Cathode.