Check the source, my friend, check the source

/* Source Code to Windows XP -- */

#include<"win31.h">
#include<"win95.h">
#include<"evenmore.h">
#include<"oldstuff.h">
#include<"billrulz.h">
#define INSTALL = HARD

char make_prog_look_big[1600000];
void main()
{
while(!CRASHED)
{
display_copyright_message();
display_bill_rules_message();
do_nothing_loop();
if (first_time_installation)
{
make_50_megabyte_swapfile();
do_nothing_loop();
totally_screw_up_HPFS_file_system();
search_and_destroy_the_rest_of_OS/2();
hang_system();
}

write_something(anything);
display_copyright_message();
do_nothing_loop();
do_some_stuff();

if (still_not_crashed)
{
display_copyright_message();
do_nothing_loop();
basically_run_windows_3.1();
do_nothing_loop();
do_nothing_loop();
}
}

if (detect_cache())
disable_cache();

if (fast_cpu())
{
set_wait_states(lots);
set_mouse(speed, very_slow);
set_mouse(action, jumpy);
set_mouse(reaction, sometimes);
}

/* printf("Welcome to Windows 3.11"); */
/* printf("Welcome to Windows 95"); */
/* printf("Welcome to Windows 98"); */
/* printf("Welcome to Windows 98 SE"); */
/* printf("Welcome to Windows ME"); */
/* printf("Welcome to Windows 2000"); */
printf("Welcome to Windows XP");
if (system_ok())
crash(to_dos_prompt)
else
system_memory = open("a:\swp0001.swp", O_CREATE);

while(something)
{
sleep(5);
get_user_input();
sleep(5);
act_on_user_input();
sleep(5);
}
create_general_protection_fault();
}