K guys, wanted to try all you said, but there's another problem.
I discovered my nexus isn't rooted. Bootloader unlocked, but any root checker says its unrooted (of course it was before...). So I'm trying to reroot it but when im connecting my phone via usb in bootloader windows 7 doesn't recognize the device. When the phone is connected in recovery or in normal usb debugging mode it recognizes it as adb android, looks good to me. I go back to booloader and i get "Windows has stopped this device because it has reported problems. (Code 43)" in Devices.
Installed the drivers on few different ways.
So.... what now ?