I have an HP EliteBook 8530w running XP SP3. I installed libusb-win32 and it worked fine. Later I installed iTunes then found when I ran the libusb test program I got a BSOD. I also found when I shutdown I got a BSOD just before power off and the laptop would reboot.
I tried uninstalling iTunes but the libusb test program still gives a BSOD. I had to remove libusb as well before this problem disappeared.