Q> Как грохнуть процесс(в том числе системный)?
A>

#include <windows.h>
#include <stdio.h>
#pragma hdrstop

// fkill forces a kill -- it will attempt to enable SeDebugPrivilege
// before opening its process handles, allowing it to kill processes
// running under builtin\system (LocalSystem, to the users out there).

int main( int argc, char *argv[] );
void getDebugPriv( void );

#define isBadHandle(h) ( (h) == NULL || (h) == INVALID_HANDLE_VALUE )
#define lenof(x) ( sizeof (x) / sizeof ((x)[0]) )

const int MAXPID = 1024;

int main( int argc, char *argv[] )
{
int pidCount, i, errors;
char *p;
HANDLE hProcess;
static DWORD pid[MAXPID];

// parse args, build PID list
errors = pidCount = 0;

for ( i = 1; i < argc; i ++ )
{
if ( pidCount == lenof( pid ) ) {
errors ++;
break;
}

pid[pidCount] = strtol( argv[i], &p, 0 );
if ( p == argv[i] || *p )
errors ++;
else
pidCount ++;
}

if ( errors || pidCount == 0 )
{
puts( "Usage: fkill pid [...]" );
puts( "fkill tries to kill the processes specified by the PIDs. If the" );
puts( "user has debug privileges, fkill is able to kill system processes." );
puts( "PIDs may be decimal, octal (starts with 0), or hex (starts with 0x)."
);
return MAXPID + 1;
}

// try to acquire SeDebugPrivilege
getDebugPriv(); //см. faq выше

errors = 0;
// for each PID:
for ( i = 0; i < pidCount; i ++ )
{
printf( "pid %lu: ", pid[i] );

// open process
hProcess = OpenProcess( PROCESS_TERMINATE, FALSE, pid[i] );
if ( isBadHandle( hProcess ) )
printf( "OpenProcess() failed, err = %lu\n", GetLastError() );
else
{
// kill process
if ( ! TerminateProcess( hProcess, (DWORD) -1 ) )
printf( "TerminateProcess() failed, err = %lu\n", GetLastError() );
else
puts( "killed." );

// close handle
CloseHandle( hProcess );
}
}

return 0;
}