Bonjour,
Voilà, c'est fait.. J'ai créé un VirtualHost pour mes deux sites !
Et... demie victoire !
Celui de l'association fonctionne parfaitement en revanche, le mien (lesArtsDuCoin) me redirige toujours sur l'hébergement...
Je lance 
localhost/lesArtsDuCoin/admin/ et j'arrive sur 
les-arts-du-coin.fr/install/upgrade.php côté hébergement...
Si je lance simplement 
localhost/lesArtsDuCoin/ j'obtiens cet écran d'erreur :
Code :
[== Indéfini ==]
( ! ) Warning: array_keys() expects parameter 1 to be array, null given in C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php on line 85
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.1970    438240    require_once( 'C:\wamp\www\lesArtsDuCoin\include.php' )    ..\index.php:71
3    0.3210    4453808    CmsRegularTaskHandler::handle_tasks( )    ..\include.php:289
4    0.3350    4560488    CmsRegularTaskHandler::execute( )    ..\class.CmsRegularTaskHandler.php:184
5    0.3410    4561576    PruneAdminlogTask->on_success( )    ..\class.CmsRegularTaskHandler.php:140
6    0.3410    4561704    set_site_preference( )    ..\class.PruneAdminlog.task.php:53
7    0.3410    4561824    cms_siteprefs::set( )    ..\page.functions.php:512
8    0.3410    4561888    cms_siteprefs::exists( )    ..\class.cms_siteprefs.php:102
9    0.3420    4561864    array_keys ( )    ..\class.cms_siteprefs.php:85
( ! ) Warning: in_array() expects parameter 2 to be array, null given in C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php on line 85
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.1970    438240    require_once( 'C:\wamp\www\lesArtsDuCoin\include.php' )    ..\index.php:71
3    0.3210    4453808    CmsRegularTaskHandler::handle_tasks( )    ..\include.php:289
4    0.3350    4560488    CmsRegularTaskHandler::execute( )    ..\class.CmsRegularTaskHandler.php:184
5    0.3410    4561576    PruneAdminlogTask->on_success( )    ..\class.CmsRegularTaskHandler.php:140
6    0.3410    4561704    set_site_preference( )    ..\class.PruneAdminlog.task.php:53
7    0.3410    4561824    cms_siteprefs::set( )    ..\page.functions.php:512
8    0.3410    4561888    cms_siteprefs::exists( )    ..\class.cms_siteprefs.php:102
9    0.3480    4562168    in_array ( )    ..\class.cms_siteprefs.php:85
( ! ) Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php:85) in C:\wamp\www\lesArtsDuCoin\index.php on line 295
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.3730    4777264    header ( )    ..\index.php:295
( ! ) Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php:85) in C:\wamp\www\lesArtsDuCoin\index.php on line 296
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.3750    4777576    header ( )    ..\index.php:296
( ! ) Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php:85) in C:\wamp\www\lesArtsDuCoin\index.php on line 297
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.3770    4777584    header ( )    ..\index.php:297
( ! ) Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php:85) in C:\wamp\www\lesArtsDuCoin\index.php on line 298
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.3790    4777624    header ( )    ..\index.php:298
( ! ) Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php:85) in C:\wamp\www\lesArtsDuCoin\index.php on line 299
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.3810    4777552    header ( )    ..\index.php:299
( ! ) Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php:85) in C:\wamp\www\lesArtsDuCoin\lib\misc.functions.php on line 228
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.3830    4777456    ErrorHandler404( )    ..\index.php:301
3    0.3830    4777816    header ( )    ..\misc.functions.php:228
( ! ) Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\lesArtsDuCoin\lib\classes\class.cms_siteprefs.php:85) in C:\wamp\www\lesArtsDuCoin\lib\misc.functions.php on line 229
Call Stack
#    Time    Memory    Function    Location
1    0.1880    363056    {main}( )    ..\index.php:0
2    0.3830    4777456    ErrorHandler404( )    ..\index.php:301
3    0.3850    4777896    header ( )    ..\misc.functions.php:229
Not Found
The requested URL was not found on this server.
Bien sûr ... je reste quoi ! J'ai tout lu. Je suis allé sur les fichiers indiqué...  

 ...
Mais je n'ai pas trouvé ce qu'il fallait rectifier  

  évidemment !
Voici à tout hasard mon contenu VirtualHost :
Code :
[== Indéfini ==]
</VirtualHost>
# Site Les Arts du coin.
<VirtualHost *:80>
  DocumentRoot "C:/wamp/www/lesArtsDuCoin"
  ServerName lesArtsDuCoin
  ServerAlias www.lesArtsDuCoin
  <Directory  "C:/wamp/www/lesArtsDuCoin/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride All
    Require local
  </Directory>
</VirtualHost>
# Site TERROIRS77.
<VirtualHost *:80>
  DocumentRoot "C:/wamp/www/terroirs77"
  ServerName terroirs77
  ServerAlias www.terroirs77
  <Directory  "C:/wamp/www/terroirs77/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride All
    Require local
  </Directory>
</VirtualHost>
Sans doute pas grand chose... ?! 
 
Toujours ravi.