Check the manual again about the proper way to remove the "scanners lockbar" and read this.
http://www.visioneer.com/support/general/FAQ/lockmessage.asp
Symptom:
After installing the scanner, a message from Scan Manager asks that you verify the scanner has been unlocked, or the Visioneer OneTouch driver displays instructions to unlock the scanner.
Scanner lock message
Symptom:
After installing the scanner, a message from Scan Manager asks that you verify the scanner has been unlocked, or the Visioneer OneTouch driver displays instructions to unlock the scanner.
Cause:
This is a default error code when a scanner is unable to calibrate. The default response by the driver is to ensure the scanning head is not physically locked in place.
Toggle the shipping lock on the product to ensure it is not engaged. The lock is normally found on the bottom, toward the end with the power supply connection.
Ensure you are using the power supply that was provided with the scanner. The label should be Bestec or HYI 100-120V AC input, and 12V DC Output, plugged directly into a wall outlet, not a power strip. The power through the strip may be fluctuating and causing the problem.
Verify you are using the minimum memory required to run the scanner: minimum requirements include 64MB of Ram.
Download and install the driver provided on the support website.
Click
HERE for the drivers page.