Assuming you just inserted and ran the installation disk that came when you purchased your scanner, some default program pops up when you scan something. The settings to change should be in there somewhere. Sometimes the default program is pretty worthless (in my opinion), and, if you are lucky, more powerful ones are included and installed from that disk. After playing with the ones that came with my scanner, I've found that Presto PageManager is actually one of the better (if not the best of the) programs for scanning with, but I had to play around with the settings to figure it out. Perhaps this will get you started. If not, give more information on what happens when you scan--what program pops up (or which one do you open), etc...