You need a wia driver to use this device - Bell & Howell B we Bell + Howell Truper 3600

Hi ,
WIA is included in Windows . Go to "Start \ Devices and Printers " and double click on the scanner's icon . I use a third party free twain program working fine in WIA mode : http://download.cnet.com/FreeKapture/3000-2094_4-10711598.html
You first need to make sure the last valuable original driver/software of your unit is correctly installed , even if it isn't good for W7 or Vista .
Regards .

1st You download Webcam Driver.
WIA driver to use this deviceAfter this install the Webcam driver in the system.
Installation of Webcam Driver
Go to the control panel
Click on the System Icon
Click on the Hardware Tab
Click on the Device Manager s
Select the Unknown Device or printer device where yellow Question Marks sign on it.
Right click on it and uninstall it.
After this go to the top of the device manager and click on scan for hardware changes.
Driver installation Wizard start.
Brows Your Driver from the Hard Disk and click on next.
Driver will be install.

WIA driver for AcerScan 620

*Follow this link from Microsoft to download the latest driver.
*This page provides a list of Windows Image Acquisition (WIA) devices with built-in drivers in the Microsoft Windows XP operating system. There is no need for additional drivers to get the WIA experience out of the box when installing these devices.
*For up-to-date drivers for specific devices, see Microsoft Update.

WIA driver for AcerScan 320

*Follow this link from Microsoft to download the latest driver.
*This page provides a list of Windows Image Acquisition (WIA) devices with built-in drivers in the Microsoft Windows XP operating system. There is no need for additional drivers to get the WIA experience out of the box when installing these devices.
*For up-to-date drivers for specific devices, see Microsoft Update.

WIA driver for AcerScan 620P

*Follow this link from mirxosoft to download the latest driver.
*This page provides a list of Windows Image Acquisition (WIA) devices with built-in drivers in the Microsoft Windows XP operating system. There is no need for additional drivers to get the WIA experience out of the box when installing these devices.

WIA driver for AcerScan 310

*Follow this link from Microsoft to download the latest driver.
*This page provides a list of Windows Image Acquisition (WIA) devices with built-in drivers in the Microsoft Windows XP operating system. There is no need for additional drivers to get the WIA experience out of the box when installing these devices.
*For up-to-date drivers for specific devices, see Microsoft Update.

WIA driver for AcerScan 320

*Follow this link from Microsoft to download the latest driver.
*This page provides a list of Windows Image Acquisition (WIA) devices with built-in drivers in the Microsoft Windows XP operating system. There is no need for additional drivers to get the WIA experience out of the box when installing these devices.
*For up-to-date drivers for specific devices, see Microsoft Update.

You can download an up to date XP driver for this scanner from

http://www.bioticaindia.com/acerscan-prisa-620p.html

You will need to register and login but it is free.

WIA driver for AcerScan 310
*Follow this link from Microsoft to download the latest driver.
*This page provides a list of Windows Image Acquisition (WIA) devices with built-in drivers in the Microsoft Windows XP operating system. There is no need for additional drivers to get the WIA experience out of the box when installing these devices.
*For up-to-date drivers for specific devices, see Microsoft Update.

WIA driver for AcerScan 320

*Follow this link from Microsoft to download the latest driver.
*This page provides a list of Windows Image Acquisition (WIA) devices with built-in drivers in the Microsoft Windows XP operating system. There is no need for additional drivers to get the WIA experience out of the box when installing these devices.
*For up-to-date drivers for specific devices, see Microsoft Update.