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I have the same problem with my Canoscan LiDE 25 scanner used sparingly since purchase in 2008. Last used 3 days back after a gap of a few months when it scanned a few pages and then stopped working. On connecting the scanner to my laptop on Vista Home Premium 32-bit it shows "USB device not recognized". No change in status after uninstalling drivers, cleaning my system, and reinstalling drivers from the Canon CD, or Canon US site, or Canon UK site. Even tried VueScan but this also does not recognize the scanner. I find it hard to believe that a Canon product stops working in barely 5-6 years even though it is very sparingly used and stored in the original packing when not in use.
If it is USB and the device is not recognized in control panel, then there is no power to the system. The cool white fluorescent tubes used in scanners only last approximately one year. Other parts may last about the same time. It's time to change the scanner. It's too costly to change the power unit inside the scanner.
After disconnecting and later reconnecting the scanner no longer worked. The lamp started flashing 6 times with pause. The scanner was no longer recognised by the computer. I fixed it by disconnecting the usb and current plugs, and reconnecting the current plug while pushing the first en third buttons from the left on the front of the scanner.
Power everything down, computer and scanner. Make sure your scanner is connected to the AC wall outlet, and to the pc. Then turn on your computer. Reinstall the driver and software by following this link
And download the latest update (2007) and you should be good to go
This is most likely only happening when attempting to scan through the CanoScan Toolbox. You can scan directly through ArcSoft PhotoStudio which came with the scanner. However, the error through Toolbox is likely caused by some limitation or restriction in the computer, possibly permissions of some sort. You may try deleting temp files from the Temp folder on the hard drive.