This has always been a problem with the latest releases on Mandrake.
You would be best to have a new installation with the usb mouse in when you install.
I had no problem with 10.1 and 10.2 with usb mice on a laptop, but then I always do a fresh install as the upgrades rarely get the hardware right and it's
more trouble than it's worth, saving your files on a dvd, reinstalling and dragging the old stuff back.