[q] help [urgent] topic

i know there have been a lot of posts regarding the fix of the "Android phone cant connect to pc", and i have tried almost all methods. but still didnt got any working solution. i am using windows 8 x64 and i am stuck in a bootloop after restarting my nexus 4. also the phone is not recognized by my pc. its always detected as an unknown device. then i tried to wipe the system and again install a fresh rom but pc wont recognize it as adb device. i installed latest google usb drivers from device manager and android sdk. i have twrp recovery. i tried adb sideload but it isnt working . please help !!!:(:( my phone is DEAD!! :(