USB not detecting my Lumia 620 in PC after installed WP 8.1

Plug in phone > Open device manager on PC > Portable Devices > Lumia > update drivers. There's a desktop app that will be installed. I assume this came with drivers. This is very similar to Samsung's Kies. I had to install Kies which came with the drivers before my PC dould detect my previous phone.

Worked for me. Hope this works for you.
 
1) Go to Device Manager
2) Unplug and replug your phone to USB Port
3) You would notice new device detected under Other Devices with exclamation mark(s)
4) Right click to update the drivers
 

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