Bug pour débutant?

Bonjour, je commence à utiliser Drupal et après avoir installé quelque module (cTools et fields (email, date, adresse) pour créer des "content type", on m'annonce un message d'erreur lorsque j'essaie de créer de nouveau "content type" ou même d'éditer ceux qui existent. Le voici ce message :

Additional uncaught exception thrown while handling exception.
Original

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT name, machine_name, vid FROM {taxonomy_vocabulary}; Array ( ) in taxonomy_vocabulary_get_names() (line 839 of C:\Users\Utilisateur\Sites\tiktact\modules\taxonomy\taxonomy.module).
Additional

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: INSERT INTO {watchdog} (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9); Array ( [:db_insert_placeholder_0] => 1 [:db_insert_placeholder_1] => php [:db_insert_placeholder_2] => %type: !message in %function (line %line of %file). [:db_insert_placeholder_3] => a:6:{s:5:"%type";s:12:"PDOException";s:8:"!message";s:134:"SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT name, machine_name, vid FROM {taxonomy_vocabulary}; Array ( ) ";s:9:"%function";s:31:"taxonomy_vocabulary_get_names()";s:5:"%file";s:67:"C:\Users\Utilisateur\Sites\tiktact\modules\taxonomy\taxonomy.module";s:5:"%line";i:839;s:14:"severity_level";i:3;} [:db_insert_placeholder_4] => 3 [:db_insert_placeholder_5] => [:db_insert_placeholder_6] => http://tiktact:8082/admin/structure/types/manage/clients [:db_insert_placeholder_7] => http://tiktact:8082/ [:db_insert_placeholder_8] => 127.0.0.1 [:db_insert_placeholder_9] => 1317862510 ) in dblog_watchdog() (line 157 of C:\Users\Utilisateur\Sites\tiktact\modules\dblog\dblog.module).

J'ai trouvé ça dans phpMyAdmin:

The additional features for working with linked tables have been deactivated. To find out why click here. Your PHP MySQL library version 5.0.51a differs from your MySQL server version 5.1.54. This may cause unpredictable behavior.

Finalement, j'ai ce message log dans mes rapports: Theme key "" not found

Je vous en prie, j'ai besoin d'aide. Je ne sais plus vers qui me retourner... Au plaisir de vous répondre.
ZeDave