You can probably handle this yourself.
On your computer go to "Control Panel" or find "Devices and Printers" by doing a search.
In the Printers section find your printer and click it once. Then right click on it and "Delete" (or remove printer) Yes it sounds severe but windows will detect your printer when it restarts and install the software for it. You will not need the original disk.
Restart your computer.
Restart your printer.
If that doesn't fix it, then your need to update the printer driver (software for the printer to make it compatible with Windows 7)
Find your printer on the linked page below and go from there. Follow those instructions. Usually easier than you might think.
Windows 7 Compatible Models | Brother
Good luck.