Aqui tienes la información que he encontrado sobre tu scanner en ingles (al final tienes la pagina del cd de instalación)...
WindowsXP built-in drivers support directly basic scanning functions of this scanner. The installation of Umax drivers is not necessary. The limitation of the Microsoft drivers is the lack of support for scan buttons and transparency adapters. See Microsoft Hardware Compatibility List.
WinXP detects the scanner as Astra 3400 and supports its basic functions with its own WIA driver model. Changing the driver in the device manager, as described on our driver download web page for Astra 3400, allows to access the scanner with VistaScan. This is also possible with the driver version that shipped with the scanner, except for possible malfunction of the integrated OCR engine.
The driver is also available on the Umax Windows archive CD.
http://www.umax.de/support/CDs/CDorderE.htm