Ministation HD-Patu3 not showing in Windows 7

[Halvliter]

I have a Buffalo Ministation HD-Patu3 Thunderbolt/USB3 disk, and I'm trying to connect it to a Windows 7 machine. It will not show in My Computer or Disk Managment, but it is showing in Device Manager. I've tried to update the driver, but Windows thinks it has the newest driver.

I chose "Uninstall" to remove the driver, but no luck.

It works perfectly on my Mac, both in HFS+ and FAT with no problems, but not on my Windows 7 machine. And yes, I have software that enables me to read HFS+ disks in Windows 7.

Thank you.

EDIT: I tried to connect it with an Acer Aspire One, a small laptop with Windows 7, and it found at once. Did a new format in NTFS, but nothing on my other Windows 7 machine.