W7 Won't Show HDD In My Computer

So the drives in question are 3 Seagate 1.5tb 7200.11 HD's.

They show up fine in the BIOS where they are all listed as slaves (ga-p55-ud4p) and in Device Manager - which lists them all as working properly. I cannot distinguish one from another in Device Manager, and the one that is working has very important legal files on it.

However, I can only see one in "My Computer" - but the other 2 I cannot "see" them so I cannot access them.

The one I can see is the oldest one and was not altered when the older PC was upgraded (upgraded all components except HD's and OS). I also kept 2 older WD 500AAKS which are both working fine as well.

The two I cannot see: One is brand new. The other was reformatted to blank (quick) on another PC (which was upgraded to Win7 at that time) which subsequently could not see the drive. I moved it over to this faster PC and still cannot see it.

All these 1.5tb Seagate drives are CC firmware so are not part of the older firmware issue. None have any 1.5gb jumpers on them.

Mobo drivers are all fully up to date - I just re-updated all of them. Windows is up to date. Windows does show in the Troubleshooter that a USB controller driver is not found and I cannot seem to find out how to install it (via uninstalling it, updating drivers, etc etc - question thread

http://www.tomshardware.com/forum/270613-30-ud4p-win7-64bitpro-controller-driver

ga-p55-ud4p rev.1, i7 860, 4gb gskill eco ram, xfx 5890, Seasonic X750 gold, very cool system...

What gives? Any ideas?