Need twain driver for mfc 7840w to scan - Brother MFC 7840W Printer

I had the same problem with windows 7 and some time ago with vista and after endless hours found a solution which I can now describe for windows 7 only but It should also work in a similar way for vista.

first of all download the latest complete mfc installation software from brother for your mfc printer - this is a big file of more than 120mb. I have installed the 32bit version although I have win7-64 but generally I have better results with 32bit drivers for general application purpose.

also download the software to delete the pnp drivers delinf_10100.exe. then download the CCleaner from http://www.piriform.com/ (or if you have registry cleaner then use this - the ccleaner is free and good).

use windows explorer to examine and delete files and look for this directory (in win7): c:\Users\<your user name>\AppData\Local\Temp.

if you do not find this directory then open: Tools/Folder Options.../View/ and there make that hidden files and folders are being displayed (the default is hidden).

if you do not even see the menu 'Tools' the go to Organize/Layout/ and activate the Menu Bar. then Tools will also appear.

when you have finally found c:\Users\<your user name>\AppData\Local\Temp then you can start the work.

- empty your waste basket so it is completely empty

- if you know the procedure then make a new system restore point

- delete all files and folders in c:\Users\<your user name>\AppData\Local\Temp\ (only in the Temp_directory)

- in control panel uninstall the existing brother mfc software (do not reboot yet)

- run the downloaded delinf_10100.exe to delete possible pnp drivers (plug'n play)

- run the cclean registry cleaner until you will not find anymore bad registry entries

- turn off and disconnect the brother device from your pc/notebook

- reboot the system and run the registry again

- install the brother software until it asks you to plug in the usb cable and turn on the printer

- then wait - the pc is working but unfortunately not showing much of this....

- when the installation is finished you might have to reboot again

- then you are don and all should be fine (cc4 running and twain driver installed successfully)

good luck! ron

Here is the link from where you can download the driver, just filter the results by your operating system and then scroll down to the Printer Driver & Scanner Driver section: http://welcome.solutions.brother.com/bsc/public/us/us/en/dlf/download_top.html?reg=us&c=us&lang=en&prod=mfc7840w_all