Getting all window handles on taskbar

Hi.
Here is my problem:
I want to get the HWND of every window that is running and terminate the window except my own window
(it's for a program to protect my computer).

I just can't get it good to work, I have tried many things but all didn't work, here is some code:

PHP Code:

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//In the infinity loop, near the PeekMessage function

Other_Window = GetWindow ( Main_Window, GW_HWNDPREV );//Get a window from the taskbar

        if ( Main_Window != Other_Window )//Check if it is my own window
        {

            DWORD Process_ID;

            GetWindowThreadProcessId ( Other_Window, & Process_ID );

            HANDLE Illigal_Process = OpenProcess ( PROCESS_TERMINATE, FALSE, Process_ID );

            TerminateProcess ( Illigal_Process, 0 );

            CloseHandle ( Illigal_Process );
        } 


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What goes wrong: first of all, it doesn't do anything, but if I press Ctrl + Alt + Delete it immediate terminates the Windows Task Manager,
which is good but all the other applications are still running and if I press on the Taskbar the code terminates explorer.exe.
I tried to prevent this by: GetDesktopWindow() != Other_Window, doesn't work.

How can I get all the HWND's of visible windows in the taskbar to terminate them that only my program stands and without terminating explorer.exe?

Woot, I finally got it now, here is an example how to get all visible windows that are running on desktop, from this code I can do what I want:

PHP Code:

---

#include <iostream>
#include <windows.h>

using namespace std;

bool CALLBACK Process_Windows ( HWND Window )
{

    char Window_Caption [ 1024 ],
         Window_Class [ 1024 ];

    if ( IsWindowVisible ( Window ) )
    {

        if ( GetWindowText ( Window, Window_Caption, 1024 ) <= 0 )
        {

            cout << "\"No Caption\"";
        }

        else
        {

            cout << Window_Caption;
        }

        cout << endl;

        if ( GetClassName ( Window, Window_Class, 1024 ) <= 0 )
        {

            cout << "\"No Class\"";
        }

        else
        {

            cout << Window_Class;
        }

        cout << endl << endl;
    }

    return true;
}

int main()
{

    EnumWindows ( ( WNDENUMPROC ) Process_Windows, 0 );

    cin.get();
} 


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Oh and thanks for the loads and loads of reply's, I even couldn't read them all because there were so many...