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#11
You really only need to install the TWAIN driver from the canon site: Canon U.S.A., Inc. | CanoScan LiDE 25
Once you have the TWAIN driver installed, you can scan from many TWAIN compatible applications. For instance, older versions of MS Word supported scanning. One application I know of off the top of my head you can use is IrfanView - Official Homepage - One of the Most Popular Viewers Worldwide
Goto File->"Select scan/TWAIN source" to select which TWAIN source to use (your scanner), then Goto File->Acquire to actually do the scanning. A dialog will popup allowing you to select options such as the destination folder for the scan.