Q> Как стереть самого себя?
A> Эта программа уничтожает саму себя.

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

void DelSelf(void)
{
char modulename[MAX_PATH];
char batfile[MAX_PATH];
char batlines[MAX_PATH*4];
LPSTR tempdir;
char Buf[MAX_PATH];

GetModuleFileName(NULL,modulename,MAX_PATH);

tempdir = ((GetEnvironmentVariable(TEXT("TEMP"),
Buf, MAX_PATH) > 0) ? Buf : NULL);

strcpy(batfile,tempdir);
strcat(batfile,"\\");
strcat(batfile,"delself.bat");
strcpy(batlines,"@echo off\n:try\ndel ");
strcat(batlines,modulename);
strcat(batlines,"\nif exist ");
strcat(batlines,modulename);
strcat(batlines," goto try\n");
strcat(batlines,"del ");
strcat(batlines,batfile);

DWORD NOfBytes;

HANDLE hbf= CreateFile(batfile, GENERIC_WRITE | GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL, NULL);

WriteFile(hbf,batlines,strlen(batlines),&NOfBytes, NULL);
CloseHandle(hbf);

STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory( &si, sizeof(si) );
si.cb = sizeof(si);
si.wShowWindow = SW_HIDE;
si.dwFlags = STARTF_USESHOWWINDOW;

CreateProcess(
NULL,
batfile,
NULL,
NULL,
FALSE,
IDLE_PRIORITY_CLASS|DETACHED_PROCESS,
NULL,
NULL,
&si,
&pi);

}
void main()
{
DelSelf();
}