Did you install the scan software (My Brother came with Paper Port)? The printer driver and scan driver are different.

I would suggest a System Restore to clean the thing out then re-install, but I notice you had this probelm a few weeks ago, so it may not be feasible. The other option is uninstall your Brother drivers and reinstall - but when you reinstall, disable your firewall/antivirus (and disconnect from the Internet during this time).