Download that then http://www.sendspace.com/file/93fx93
Download the zip file from this location: Download DFU.zip from Sendspace.com - send big files the easy way
2. Extract the downloade zip file
Create new folder in drive C: and name it DFU. Extract the zip file to the location: c:\DFU
3. Connect your iPhone
Connect your iPhone but close iTunes when it launches after your connect your Apple device.
4. Launch the program downloaded
To launch the file, goto start > run and type (write run in search box in start menu on microsoft windows vista and seven)
This will enter your iPhone or iPod touch into the dfu mode and now you can proceed with your task which you needed your iPhone to be in dfu mode for.