I run that board.
Just to verify, which SATA controller are you plugged into? If it's the SATA2 controller that is on its own, then you need the JMicron driver. If it's one of the other 2 (normal SATA 1 ports, situated both next to one another), then you need a working version of the ULI drivers.
I suggested the enclosure because that would be a sure way to see that your files are ok, while also being a handy bit of kit for any PC enthusiast. I also know that this board, however much I may love it, can have problems with network card drivers and such. Dunno whether this also applies to SATA drivers.