iPhone 4 Apple Recovery (DFU) USB Driver NEED HELP!!

Hello,

My iPhone 4 got version 4.2.1 but when i go to computer > properties >device management then i see: Apple Recovery (DFU) USB Driver.

I know that it is in dfu mode but i really dont know how i can get out of here. I tried everything what i can do i tried now 3 days to fix this but i dont have any results. My iphone 4 wont turn on but when i connect it with my computer than it says it is in recovery mode. So does anyone know how i fix Apple Recovery (DFU) USB Driver??????????