我用win-tc写了一个小程序出现the NTVDM CPU has encountered an illegal instruction

这事代码：
#include<stdio.h>

int factorial(int n)
{
if(n == 1 )
return(1);
else
return (n*factorial(n-1));
}

void main()
{
int i;
for(i=0;i<5;i++)
printf("%d! = %d\n",i,factorial(i));
getch();
return 0;
}