It seems like many of you are having problems connecting your Nexus 5 to Windows 8 and Windows 8.1. The smartphone appears in the device manager of Windows 8.1, but it is impossible to perform any action with it. No files can be transferred from the Nexus 5 on the PC, and the smartphone is invisible in the file explorer. Here is a confirmed solution, which should resolve connection issues where your PC won't read your Nexus 5.
Since the last set of Microsoft updates, I cannot connect my nexus 5 or nexus 7 (android 4.4.4) to my windows 8.1 64bit desktop. Here is the solution
Its really a driver (or an incorrect drive allocated issue, due to be knocked out by updates) issue.
1. In Nexus 5 or 7, make sure USB debugging mode is enabled, and go into storage and hit menu USB connection and ensure USB mode is set to MTP. First make sure that the MTP is enabled on the Nexus 5: Settings > Storage > Menu > USB connection to the computer
2. Connect tablet to PC.
3. In windows device manager find ADB Driver (May be Acer) then drill down. Right click and select "update driver software".
4. Select "Browse my computer for driver software".
5. Select "Let me pick from a list of device drivers on my computer."
6. With "show compatible hardware" checkbox ticked, two drivers should be shown.
(a) Android ADB Interface. and (b) MTP User Device or Composite USB device.
7. Select (b) above and click Next.
8. Device should now appear in Portal devices section with your device name.
