For the 16F88, this is what the beginning of your code should look like if you are setting the configs in code space and want the ADC off, MCLR as an input, internal 4MHz.
Code:
    DEFINE OSC 4           
    OSCCON = %01100000
    @ __config _CONFIG1, _INTRC_IO & _WDT_OFF & _LVP_OFF & _MCLR_OFF &_CP_OFF
    ANSEL = %00000000