1. i don't see any PIC #
2. i don't see any config fuses.
3. I don't see any INTCON and other interrupt related registers

Fast reading of your code but it may work. now just comment out your whole ISR and toggle a led in and then clear RCIF falg by reading RCREG untill it's empty.

Is the thing work or not? If not, your baudrate, config fuses and or hardware is faulty.

Easier way, HSERIN/HSEROUT to echo your incomming data to you PC.

Is this working or not?