I have upgraded to Windows 7. Where can I get drivers for Visioneer One Touch 8920 Scanner?

I'm afraid that won't happen. Visioneer's drivers are only good through XP Service Pack 1; they won't even support XP Service Pack 2 due to the increase in security measures. There is no Windows 7 driver (or Vista, for that matter) and they don't plan on developing/releasing one as the product is discontinued.

Sorry...but hope that was helpful.

The 9420 visioneer Scanner driver will run the 8900 scanner.
first,go to visioneer and download the .MSI file for the 9420. Run it. The driver files will be found in directory: C:\Visioneer\OneTouch 4.0\9420 Drivers.next, find the 8900 drivers.they will be in c:\ Windows\twain_32\vizscan8xxx. open the file and look for rtscan.dll Rename it old rtscan.dll.if you can't find them,either use Device manager to show you where they are. or you can reinstall the Driver(Xp\2000\Me\Win 89 from Visioneer site. Rename the rtscan.dll file which will be in the twain_32 folder(see above).
copy all the files in 9420 Driver file to the c:\Windows\twain_32\vizcsan8xxx folder. turn your scanner on.windows should find the drivers and install the scanner.

There is not a driver available for Windows 7. One thing you can try is to run the software in windows XP compatibility mode if your version of Windows has it. When you go to run the software disc for the scanner goto my computer and right-click on the icon then click properties. You can then set the compatibility mode to run on XP. Then run the software by double left click on the icon after you have set the compatibilty mode for XP. I cannot guarantee this will work but it is worth a try. If you download the software to the desktop the process is the same.

.the Visioneer 9420 scanner program will run the 8900. You can run Visioneer 8900 in Windows 7, and Vista. uing thedriver for9420. Please type 'Can I run Vissioner 8900in vista?
you should see a web site for icrosoft forums that gives the steps involved to get your scanner to work in both Vista and Windows 7.0

Below is a link to the list  of the only scanners that VISIONEER has written a Vista driver for(and not likly to write any more for former scaners.)  Your model in not on that list. Unless, for some reason , they decide to write a Vista driver,you will never bve ableo to use that scanner with the Vista  OS. No one else will ever write one either.     Please don't rate me badly for telling the whole truth even thought you may not like it.  http://support.visioneer.com/products/tools/os/vista.asp

The below link is where I took the followign from: http://support.visioneer.com/UK/products/tools/OS/
As Microsoft continues to release new versions of it's Windows Operating System, the requirements for peripherals and software change. Visioneer scanners are designed to leverage the tools and features included with the operating systems that are current when products are released. When feasible, we develop scanner drivers for new versions of Windows. On the day Windows XP was released, Visioneer had more scanners qualified to wear the Designed for Windows XP logo than any other scanner maker. In spite of our best efforts, major changes in the underlying architecture of Windows XP make it impossible to write new drivers for many of our older model scanners.   Visioneer posts the last release of drivers on each Product's Homepage and provides online support for older products. Scanners designed to work with older versions of Windows may not function properly after upgrading your computer's operating system.   We offer an industry leading upgrade program, giving a 25% discount from our online scanner store for customers that return their old unit to ensure proper disposal as part of our environmental recycling program. For details visit Visioneer's Trade Up Offer.

Here is the link to your model scanner to download the driver from:
http://support.visioneer.com/UK/products/home/EOL/8900/downloads.asp

Try this download site for the drivers. http://www.opendrivers.com/categorycompany/16/11669/scanner-visioneer-free-driver-download.html

Which windows version?
http://support.visioneer.com/

The scan motor is straining against somethinmg - so re do the lock/unlock routine and carefully examing the machine and the manual - usually in PDF on the software disk.

Hope this helps here is the location to download drivers for your scanner

http://support.visioneer.com/products/home/EOL/8900/downloads.asp

Good Luck
Jack