Pahu, this is what happened, i on the machine by pressing the alt key and 2 hard drives appeared one is the macintosh hd and the second one the external hd so i press the external hd. Next i opened the safari and download the scanner software and drive cstb4502mxen and install the scanner driver on this external hd. FYI, i have also upgraded to OS X 10.6.08 but unfortunately when i tried scanning it says Failed to open. I browsed through some of other people query and find that some ppl here says that they have to go to the application/library/preference/cano xxxx to erase some file there and some says it has to do with library/plist. May i have your opinion please.