Hello Lucprovost,
Thank you for keeping us updated on the status of the issue.
I would suggest you to try using suggestions provided in this Microsoft help article and check the issue.
Refer:
You experience Print Spooler error messages after installing or upgrading a Third-Party print driver
http://support.microsoft.com/kb/2793718
Also, refer to suggestions Marked as answer by Dale Qiao Moderator on Wednesday, May 05, 2010 1:22 AM in this link:
Note: Serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
http://windows.microsoft.com/en-us/windows/back-up-registry
I hope this information helps.
Thank you