turning LEDs ON and OFF of PIC microcontroller by reading data from putty

In your case the PIC and computer should have been connected through Serial communication.

Putty is a serial software using which you can send serial data from compter to PIC thorugh COM port.

So all you have to do is write a program on PIC to check for any incoming serial data and based on that you have to control the LED

I am using this to receive the character entered in putty. But its not working. I am using PIC24FJ128GA010.

void U2_RxByte(void)
{
    while(!(U2STAbits.URXDA));
    if(!(U2STAbits.OERR))
    {
        command = U2RXREG;
        delayFunc();
    }
}