I'm a Program Manager with Microsoft working with the Windows Error Reporting team and we've received customer reports regarding your driver libusb0.sys with a creation date of 6/11/2009 crashing on Windows 7. Currently it's crashing around 475 times per day.
Here is some text output from the debugger. Can you please take a look at the information? You may already be aware of this issue.
0:
2009-06-25 20:49:30 UTC in libusb-win32