Twain driver user account issue

I posted this in the scanner and printer forum but never got a response.
Since this issue appears to be related to user account permissions I'll post
it here instead.

Brand new HP desktop, stand alone not networked, Vista home premium, set up
one user account with admin privileges on start up. I installed a 3 year old
Cannon flatbed scanner with the latest Vista 32 bit drivers downloaded from
the Cannon site. The install was successful but I was only able to scan from
MS office apps Word, Excel, PP, not in any programs using the twain drivers.
Photoshop Elements 5.0.2 with the Vista patch and the Canon scanner software
showed no twain devices. The scanner drivers in the device mgr and control
panel were all good.

Cannon tech support had me try various things with no results; selective
start ups with msconfig, un-installing, re-downloading, re-installing. Then
they had me create another admin user account and re-install the drivers. The
scanner worked, all programs could access the twain drivers, until I
rebooted, after that both admin users could not access the scanner, except
with the MS office apps. Cannon support said the problem was with user
account permissions and since it was a Vista issue they could not provide any
help.

Contacted HP support and received no help. Spoke with two different techs,
both were clueless about how to help and said it must be a diver issue and
would have to go back to Cannon for support. Cannon suggested that I dump and
re-load Vista, a ton of work and since the only backup is the recovery disk I
created after the initial boot up chances are the issue would still be
there. Cannon rep claims they have tested the drivers on all versions of
Vista with many hardware configurations and have had no issues and my problem
is with my Vista
permissions only.

In the mean time I activated the hidden administrator account and the twain
drivers are fully functional in all programs, scanner works fine. I removed
the scanner drivers and re-installed through the hidden admin account and the
scanner is still unusable in the original admin user account. I have checked
all of
the twain files for permissions and the original admin user account shows full
permissions for all of the files in the twain32 folder.

There are no other twain devices on this system and no other twain devices
have ever been installed. Obviously I shouldn’t have to use the hidden admin
account to use the twain drivers but I can’t seem to find an answer to the
user account permission issue.

Cannon and HP support has washed their hands of this issue. Hardware is
cheap and I’d be tempted to go buy a new all in one, but I’m afraid that the
twain driver issue would still be there.

Any suggestions would be greatly appreciated.

Thanks,
Dan