Ok, well I guess that wasn't the best advice for the chip you are using.

On a 16F690, PORTA.3 is the MCLR/VPP pin, and it defaults to the "Master Clear" (MCLR). In order to use it as a digital input, MCLR must be disabled.

If using PM as the assembler then use this...
Code:
@ DEVICE MCLR_OFF
or if using MPASM..
Code:
@  __config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _CP_OFF
But you'll need to modify the 16F690.INC file in the PBP folder for it to work.

Also, PORTC.3 is multiplexed with the A/D converter, the Comparators, and the ECCP module. To use this pin as a digital output ...
Code:
ANSEL = 0
ANSELH = 0  ; for ANS8-11
The 16F690 is a very complex chip as far as PIC's go. And the datasheet is very confusing, to say the least. Wouldn't really recommend it for a first time user.

HTH,

P.S. Steve, I found the ANSELH from one of your previous posts.