Brother has the drivers for most of their printers on their support site. For the HL-2270DW, go to http://welcome.solutions.brother.com/bsc/public/us/us/en/dlf/download_top.html?reg=us&c=us&lang=en&prod=hl2270dw_all
. What OS does your computer have? Select your OS and then your language. Click on the Search button.
The Full Driver and Software Package should be the first one listed after the search. This is the version for most users. Just click on the Download & Information link. Then click Download. Look further down the page for the stand-alone drivers.
If you have another driver installed (for example, the Windows USB driver for a locally connected printer), uninstall the driver first. If it's the Brother driver, use the Brother uninstall tool. Otherwise remove the printer in the Devices and Printers Control Panel. (Click Start > Devices and Printers. Right click on the printer and choose Remove.) Then remove the USB cable if connected to the computer. Install the Brother software and then connect the USB cable when prompted to do so.
Note: this download does not include any third-party software that was on the original CD.
I hope this helps.