UMAX Technologies Astra 2000U Owner's Manual page 95

If you see these items as listed above, IRQ Steering is enabled. If
you do not see the information, contact your computer
manufacturer. USB will not function properly without IRQ
Steering.
Problem:
Scanner is not present in the Device Manager. The scanner must be
present in the Device Manager. If there is no listing for the it, the
scanner will not work.
Solution:
Follow the steps below to determine if the scanner is present in the
Device Manager.
1.
Click on the "My Computer" icon using the right mouse button.
A pop-up menu appears.
2.
Click on Properties command using the left mouse button. This
brings up the Device Manager.
3.
The scanner should be listed under the heading of Imaging
Device.
4.
If it is not present, insert the UMAX VistaScan CD-ROM into
the CD-ROM drive.
5.
Unplug the scanner cable from the back of the computer, and
then plug it back into the USB port.
6.
If the scanner does not show up, and there is no change in the
Device Manager, try the another USB port. If the scanner still
does not appear, contact your computer manufacturer.
UMAX Astra 2000U/P Owner's Guide
95