annoying startup window

Hello all. I have annoying startup windows from a Brother Multi-function printer (printer, scanner, copier, fax machine)that appear at startup just when the desktop has loaded. My machine is the Early 2001 iMac model, 500 MHz, 20 GB HD, 256 mb ram, running both OS 9.2.2 and 10.3.9 but always with the latter. I installed the printer software on the iMac but then decided to use my G3 Blue and White Power Mac instead and therefore the printer is not connected to the iMac. The problem is, at startup 2 popup windows appear that first says "Brother Device Selector" which I must close only to have the second window open that says "Brother Control Center" which also needs to be closed before being able to do anything else. This only occurs with OS 10.3.9. I know that in OS 9.2.2, removing annoying startup items is done by taking them out from the startup folder in the system folder. But can this startup window be removed in OS 10.3.9? Also, when these windows open, the Brother MFC icon is present in the menu bar. So, when I have clicked on it, the dropdown menu shows the selections "open, preferences, about, and quit." I have clicked preferences and unchecked the checked boxes that say, "show control center windows at startup" and "show splash screen at startup" and then clicked the OK button for that window which should turn off those 2 annoying windows. But then when I reopen the preferences again, both boxes are checked again! And this always happens. And this problem prevents the iMac from starting up as quick as it should and did before I installed this printer software. I've looked all over inside the OS 10 system folder but I cannot find anything that I recognize and would be able to discard. I am trying to remedy this problem without having to completely discard and reinstall OS 10.3 all over again. Any suggestions will be greatly appreciated. Thanks John