Only 1 USB drive can be used at a time - others are ignored.

This is a weird one - I can plug either of my 2 USB 3 external HD drives, or a USB 2 pen drive, but only one of them will be recognised (the first).
E.g. if I plug in the WD Ellements USB3 HD first, then plug in a second USB 3 HD, or even a USB 2.0 pen drive, neither is recognised.  Only the first drive shows up.  Additional drives dont appear in "Disk Management", and no message pops up saying "installing drivers" or similar.  Only the first drive appears in the "safely remove hardware".
I have never seen anything like this before.  I have tried rebooting etc.
It could have been like this since I got the machine - this is the first time I have connected 2 drives.
This makes copying from one drive to another impossible, and as I have completely run out of space on my internal HD, I am a bit buggered. I did buy an HD Bay adapter from Ebay, but it doesnt fit (it was cheap). 
Any Windows experts who know where to start fixing such a problem?
The ignored second drive does recieve power - it spins up and the light comes on - just nothing happens in Windows.

My suggestion is that you go into Device Manager and uninstall all of the USB hubs/controllers, shutdown completely, and reboot with nothing attached to the USB ports. Windows will rediscover all of the controllers and reinstall the correct drivers. It sounds like there's been corruption in the cache that Windows uses.
See how that works and let us know the outcome.
W520, i7-2820QM, BIOS 1.42, 1920x1080 FHD, 32 GB RAM, 2000M NVIDIA GPU, Samsung 850 Pro 1TB SSD, Crucial M550 mSata 512GB, WD 2TB USB 3.0, eSata Plextor PX-LB950UE BluRay
W520, i7-2760QM, BIOS 1.42 1920x1080 FHD, 32 GB RAM, 1000M NVIDIA GPU, Crucial M500 480GB mSata SSD, Hitachi 500GB HDD, WD 2TB USB 3.0

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