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hi amna .
I'm not asking about in proteus. Did you tried to test in hardware(which means tested in protoboard)?
If you have hardware setup, Please load the hex in microcontroller and check it without using the crystal and without adding fuses in the program. To my point, it should not work.
Because proteus has a feature called processor clock frequency which you can see in edit option of your microcontroller. You are setting the clock frequency with this option even though you didn't add the fuses in the program. So it is working in the proteus.
But during simulation in real hardware, it won't work out.
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If i'm wrong, Please correct me .
Please check your avr controller datasheet. It will have internal oscillator section and you have configured those registers. so it should run without using external crystal.
But in 18F452, it has no internal oscillator. So to run your microcontroller, you must connect the external crystal.
if you still don't want to connect external crystal, then switch to another micro-controller which has internal oscillator.
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