There are several OCR software packages on the market, some can cost as much or more than the scanner that you have. There are canon driver upgrades online unless you have done that already I would suggest doing that since you are using Win 7. Doing the driver upgrade should help functionality but I see nothing alluding to OCR. There are some free OCR downloads also, that is a possibility and may be worth a try. Meanwhile I would upgrade the drivers from Canon's site.
I have a CanonScan LIDE 200 which does exceptionally well in what I ude it for. I recently upgraded to a 64 bit Dell Optiplex and Windows 7. Windows alerted me to possible compatibility issues. I have not had any ... until I tried OCR. The Scanner's manual says OCR can only be opened with Notepad that comes with Windows. For me, that is a pain in the neck. So myb question is, can I link other OCR software and persuade the scanner to use that Software? I have in mind to use the OCR and simpy copy to the cliboard, then paste into MS Word. That used to work when I had Windows XP and Office 2003, using the same scanner! THis seems to be a Canon issue not a Windows issue. I do not find any support for this scanner on the Canon site.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic