If your copy the HARDWARE and the SOFTWARE and you do so EXACTLY, WITHOUT CHANGES in either, then it WILL WORK as advertised.

The PIC16F876A is DIFFERENT to the normal PIC16F876. From memory it has COMPARATORS and a VOLTAGE REFERENCE that need to be disabled. Please download the Datasheet from the Microchip Website to see how to accomplish this.

I reitterate, copy the OLYMPIC TIMER example EXACTLY, without any change or deviation (not even with a simple 'A' on the end of the chip is allowed) and it will work.