Reentrancy problem

      #define X      1
#define Y      2
#define Z      4	//now powers of 2
#define W      8	//I.E bit values

unsigned short SWITCH = 0;
unsigned char Previous;


void Interrupt()
unsigned char Edges,Pins;
{
  if(INTCON.INTF)
  {
       SWITCH |= W;
       PORTA.F1 = 1;
       INTCON.INTF = 0;
  }
  if(INTCON.RBIF)
  {
      Pins=PORTB;		//read the inputs
      Pins=~Pins;		//invert so active low		
      Edges=Pins^[B]Previous[/B];	//find bits that have changed
      Edges&=Pins;		//and are now high
      Previous=Pins;		//keep copy for next time
      INTCON.RBIF = 0;

unsigned short Spi_Read(unsigned short buffer);

#define X      1
#define Y      2
#define Z      4	//now powers of 2
#define W      8	//I.E bit values

unsigned short SWITCH = 0;
unsigned char Previous;


void Interrupt()
{
  unsigned char Edges,Pins;

  if(INTCON.INTF)
  {
       SWITCH |= W;
       PORTA.F1 = 1;
       INTCON.INTF = 0;
  }
  if(INTCON.RBIF)
  {
      Pins=PORTB;		//read the inputs
      Pins=~Pins;		//invert so active low		
      Edges=Pins^Previous;	//find bits that have changed
      Edges&=Pins;		//and are now high
      Previous=Pins;		//keep copy for next time
      INTCON.RBIF = 0;
      if(Edges.5 == 0)                 
      {
         SWITCH |= X;		//set X bit
      }
      if(Edges.6 == 0)             
      {
         SWITCH |= Y;
      }
      if(Edges.7 == 0)
      {
         SWITCH |= X;
      }
   }
}

void main()
{ 
   init_all();

   do {
	if(SWITCH & X){		//if X bit set then
            //call function here
            //do something here
            SWITCH&=255-X;	///reset X bit
        }
	if(SWITCH & Y){
            //call function here
            //do something here
            SWITCH&=255-Y;
        }
	if(SWITCH & Z){
            //do something here
            SWITCH&=255-Z;
        }
	if(SWITCH & W){
            //do something here
            SWITCH&=255-W;
        }

     } while(1);

//do something here

void main()
{ 
   init_all();
[COLOR="Red"]   INTCON.INTF = 0;
   INTCON.RBIF = 0;
   SWITCH=0;[/COLOR]
   do {
	if(SWITCH & X){		//if X bit set then
            //call function here
            //do something here
            SWITCH&=255-X;	///reset X bit
        }