video crabber will not work automaticly

hi there,

i have a video-grabber usb 2.0 he works fine when i install the system new. at this time i forgot to install this hardware and i want to use him now. after plugin the grabber in HW-list he is available and he will not work for me. the automatic HW- detection will not work. can i set the automatic-HW-detection to ON, but how??

thx for your help