Download Smarthru
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You can find the drivers and documentation you need here.
http://www.muratec.com/support/drivers.asp
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Try the following website. (It's the Samsung (USA) website.)
Edit:
Actually, I've just tried the link myself and found that it only lists the printer driver. At the top of the page, where it says Find, type SCX-4100 scanner driver and it WILL give you a page where you can download the scanner drivers.
Best of luck to you.
Edit 2:
The SmarThru 4 software can be obtained if you click on the Software tab.
Try here. It took me ages to find this, so I know how you feel.
http://www.samsung.com/uk/support/download/supportDown.do?group=&type=printsolutions&subtype=colourmultifunctionprinter&model_nm=CLX-2160&disp_nm=CLX-2160&language=&cate_type=all&dType=D&mType=SW&vType=&prd_ia_cd=06010100&model_cd=&menu=download