Hi,
Gone through the issue you are facing sound pretty simple however i am not sure about the operating system you have in your computer so i would give you the link for the issue u are facing.
steps to follow to download the driver:-
open the link compatible for win 95,98,9x,me,NT,xp
http://www.dirfile.com/canon_canoscan_lide_30_.htm
copy the link in the internet exploler
it would open a web page and in the middle you would see
small option download click it and run the installation file.
If problem still persists dont forgett i am still here and you are in absolutely safe hands.
Peace