Canon CanoScan8400F says "driver not found" on Mac OSX all of a sudden

We have a Canon CanoScan8400F connected to an iMac via USB and this has been working great for quite a while. Recently all of a sudden the scanning software is reporting the driver cannot be found. I tried installing the latest Canon Mac drivers from the website, and that solved nothing. I then even tried the original drivers again from the CD, nothing.

How do I "clear out" all the software/drivers to try again? It makes no sense why this would work and all of a sudden doesn't. Does anyone have any other suggestions to try as well?
LlewellynITAsked:
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ibrahim52Team LeaderCommented:
This might help you.Check it out.

Reference :
http://www.versiontracker.com/dyn/moreinfo/macosx/16292
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strungCommented:
Did you by any chance upgrade from OS 10.5.x to OS 10.6 (Snow Leopard) recently? That breaks a lot of scanner drivers as 10.6 deals with TWAIN drivers entirely differently from 10.5.
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LlewellynITAuthor Commented:
Apparently the driver cleanup tool is what made it work.
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ibrahim52Team LeaderCommented:
thank you very much for the points.
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