Printers disappear

[goliath]

I am using Avast 6.0 Pro on a Windows Vista computer, connected to a domain controller.
After installing the driver for the Brother HL-4150CDN, everything seemed to work fine. A few days later all of the printers installed on the system disappeared. I uninstalled Avast and the problem seems solved. Any suggestions what goes wrong? Thanks in advance.

[avadas.de]

Hi,

did you receive and messages from the AutoSandbox or any other shield of avast! in the time between the installation and the printers disappeared? Maybe also check each shields log.