Ok. Uninstall ALL the software of your LEXMARK and BROTHER printers, disconnect your printers and reboot the system.
After the system boot again, DON'T CONNECT ANY PRINTER, install the driver and software for the LEXMARK printer, when the installation program show you a message that say connect the printer, in that moment, you must connect the printer.
When the installation program finished, reboot your PC, wait 'till boot again and test the printer.
I removed both devices and software, rebooted, and reinstalled only the brother printer. Whenever i run the setup.exe file it installs the printer correctly and gives me a prompt to plug in my printer. When i do this windows automatically installs device driver, but the original setup from brother is stilll completed. Rebooted computer and tried to print a test page. Shows the test page in the Que like everyting is working, but no print. ????