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You have not specified the AV program you are using and if you have its install disks. Anyway. If you have the AV disks then go to Control Panel->Add Remove Programs and after selecting this anti virus program uninstall it. Reboot the PC. and reinstall the AV program.
If you do not have the AV disks then uninstall it the way explained above. Then connect to the net and download free version of AVG anti virus from www.download.com and install it.
dowload vistascan vs375u (11,674KB) and open it you will receive 6 disks+1 disk german and 1 disk english. open the disk 1 and double click VSSETUP you will see a lot of DOS commands and at the end you will have VISTASCAN in the Programs Files ( Start--All Programs--VistaScan--enter) .
If Scanner test works O.K.
- go to MyComputer right click,
- click hardware,
-click device manager,
-right click the UMAX Astra
-click update driver
-click "install from a specific location" Next "Don't search I will chose the driver to install"-- Next -- choose USB scanner (Not UMAX Astra 3400) --Next--
- you will receive a warning " continue anyway" finish
open VISTASCAN Test it will pass now