Windos XP BSOD with HP Photosmart usb device attached https://bugzilla.redhat.com/show_bug.cgi?id=524723 has all the details of the problem. I was just testing attaching a USB device to see if it really worked, and tried my HP Photosmart C5580 All-in-One printer/scanner, and the Windows XP box then started getting bluescreens and crashing at random (fairly short :-) intervals. My latest attempt was on a fedora rawhide system with pretty up to date software (qemu-kvm-0.11.0-2.fc12.x86_64), and the crashes still happen. A reply to that bugzilla recommended adding this upstream bug, so here it is. Please use qemu-1.0 + ehci. The UHCI layer seems to cause this problem when handling some USB 2.0 devices. I had similar problems but with EHCI + qemu-1.0 it was fixed. See docs/usb2.txt for USB 2.0 support. Can you still re-create this issue with the latest version of QEMU? If not, I think we should close this bug nowadays... [Expired for QEMU because there has been no activity for 60 days.]