Finding drivers for Nexus 4 is often a complicated task. So if you want to use the phone the first step is to download the drivers from:
– Developer.android.com – http://developer.android.com/sdk/win-usb.html
– XDA-Developers – http://forum.xda-developers.com/showthread.php?t=1992345
After that don’t forget to change the settings of the device to connect to the PC as a Multimedia device. The setting is in the Storage menu and will show after the click on the three vertical dots at the upper right corner.
This is an important step which you shouldn’t forget! Then choose Update driver software after the device is connected and choose the folder where the drivers are present.