search on the web. there are programs free and shareware which are doing the
job you need, but I have forgotten the names, because I have a cd-writer
now.
You either need to make the file smaller (think what is in the presentation)
see
Why are my PowerPoint files so big? What can I do about it? http://www.rdpslides.com/pptfaq/FAQ00062.htm
or compress the file to make it smaller (think winzip and the like)
(If you are using powerpoint 97 or higher winzip will not be able to compress the file much smaller)
Or span the presentation over several disks (think winzip and spanning).
Or upload it to some free webspace, then download it at your destination.
