Need help with UMAX ASTRA 6450.

This firewire scanner was given to me, but I can't get it to work. I
am running WXP PRO SP2. I have tried all the sources I can find for
drivers and software, but nothing seems to work. I note that there is
something called 'VISTASCAN X', but as yet I cannot find that animal.
I have tried a few versions of Vistascan, however, without success.
Magicscan and Vuescan do not work either. Neither does Silverfast SE
(Umax SDK). Before I forget - yes, I have the scanner powered on
before I boot the system.

I last tried 'VS376f.exe' to try to install the driver. I have tried
others.

My Device Manager shows 'UMAX Astra 6400 IEEE 1394 SBP2 Device' under
'Imaging devices', but with the dreaded yellow flag. I have tried
re-installing this, but get the same thing. Device Manager properly
shows under IEEE 1394 Bus Host Controller - 'VIA OHCI Compliant IEEE
1385 Host Controller'.

The scanner LED Power Indicator is lit, as are the scan-lights inside
the scanner. So I think the scanner is trying to work.

Before I give up and trash this scanner, I am hoping someone can
suggest something for me to try that I have not already tried.

Anyone?

Thanks - I remain hopeful.

Jethro