Hi.
To download the images directly to PC you may well need the connecting cable and software from the cd-rom but unfortunately I believe that the original transfer software, except for 'updates' if you already have the original installed, is not available for download.
However a copying method is described in the manual which you can download here:-
http://www.retrevo.com/search/v2/jsp/mytrevo/myTrevo.jsp?page=man
or just read the manual at :-
http://www.nikonusa.com/pdf/manuals/noprint/L100ENnoprint.pdfOn page 113 of the manual the following is described :-
Menu button > setup menu (spanner icon) > copy.
Then select the direction, i.e. fromthe internal memory (which will be marked 'In' on the option you need) and the memory card (illustrated with no 'In' mark), and click 'OK'.
This should at least be a way around your problem and get the images onto the sandisk memory card.