LaserSoft Imaging

I connected my Microtek 4000TF via USB,but it`s not recognized in the device manageras scanner,just as unknown device.I inserted the Microtek CD as wll as the Silverfast CD,but my system(XP) cannot find any required inf-files.
What can I do?If I just install SF (what I tried)the plugin of cours does not find the scanner
Stefan

Forget it,it works now.I made the fault to plug in the scanner via USB prior to installing the software.This way doesn`t work with USB.
Stefan