Welcome to the Canon Forums and thanks for your post!
To have a better understanding of your issue, please let everyone know what operating system (Windows Vista/7/8 or Mac OS 10.X) you are using. That way, the community will be able to assist you with suggestions appropriate for your product.
Any other details you'd like to give will only help the Community better understand your issue!
If this is a time-sensitive matter, our US-based technical support team is standing by, ready to help 24/7 via Email at http://bit.ly/EmailCanon or by phone at 1-800-OK-CANON (1-800-652-2666) weekdays between 10 AM and 10 PM ET (7 AM to 7 PM PT).
Please try the following to resolve the error:
1. Change the location where the files are being saved to after scanning.
2. Temporarily disable any antivirus or firewall software that may be on your computer and then attempt to scan again. Once the scan is completed and saved successfully, the protection software can be re-enabled.
3. Launch the scanning program under an account with administrator privileges.
If you still receive the same error, please call or email us at one of the methods on the Contact Us page for further assistance.