you might want to try and start off by doing a quick test with modprobe... see if you have usbserial module loaded
modprobe usbserial
I'm not familiar with usb-mouses, even tough I have one myself, but I use the small piece between the usb- and my "regular" mouse port. I never took the middle-piece off, because this works nicely..

you may also list your usb-related modules (all of them) by doing
modprobe -l | grep usb | less
and see if there is some candies for you. but as I said, I'm not familiar with this problem...perhaps someone other is. this just was the first thing to come ty my mind...and it won't harm you if you try to modprobe that

altough I'm quite sure it's already there... (if you get no errors, then the module is loaded properly and you may try to plug your mouse again - if you get errors, you might have it already and then this whole thing is useless)