Problem with A8N32-SLI, 4GB RAM and AHA19160 on Vista 64bit

Hi All,

I have a A8N32-SLI with 4GB RAM and a AHA19160 SCSI controller with a
tape attached running with Vista 64bit. As soon as I enable "Hardware
Memory hole remapping" in BIOS the tape is no longer available under
Vista. During boot the SCSI controller reports the tape abd Vista
still shows the 19160 in device manager, but no tape. Without
remapping I only have 3GB RAM avail, but the tape is showing under
device manager. I have flashed the latest BIOS for A8N32 (1405).
Anybody has similar issues and knows a solution to the problem?

TIA, Heribert