Pb «usb.c : USB device not accepting new address=2 (error=-71)» resolved

Hello !
In first : excuse me for my English 'cause I'm a poor lonesone (French) cowboy !!!
I would like to help those who encountered the problem I resolved today.
With de CD created with TI, I had this message during Acronis boot sequence :

usb.c : USB device not accepting new address=2 (error=-71)
usb.c : USB device not accepting new address=3 (error=-71)... etc...

The consequence was my external usb drive (that contains my backup) never appears in the TI explorer !

The reason was one virtual drive (appearing as SCSI) created with Alcohol 120%. I suppress it and now, it works !!!

I don't know why a virtual drive make TI working bad. Can someone give me the reason, please ? Thanks a lot.

Have a good day (... or night !).

PoorLonesoneCowboy