I figured out why my system always hangs when trying to load sptd.sys.

my config:
nVidia nForce 4 Chipset (driver ver. 6.69)
S-ATA II Harddisk
daemon-tools 4.03 x64

The problem is Native Command Queuing - after disabling it daemon-tools works just fine.

http://nvidia.custhelp.com/cgi-bin/n...i=&p_topview=1