Vista - Canon mp830 rmslantc.dll error (MP Navigator scan failed) (Vista x64) Problems...

I've seen a few references out there to XP having a similar issue, but
the resolutions did not fix this problem...

In Vista x64.. The only way, so far, I've been able to get this
printer to work with MP Navigator and the "Canon Mp830" twain driver
was the following (didnt work after reboot though):

I removed any existing x64 Vista drivers for the scanner (chose the
remove driver option in device manager first, then ran the uninstall
from Programs and Features)..

I then pull the usb cable.. put it back in.. let Vista auto install
the drivers.. then I ran the Driver (x64 Vista) Setup from the Canon
website. (I believe it ends up saying Canon Inkjet MP830 or similar
at this point, not positive though).

All this time MP Navigator was left alone and remained installed...

So I tried navigator.. worked fine... tried picasa.. import from
"Canon MP830" (Not the WIA Canon).. worked fine.. brought up MP
Navigator software...

I then rebooted this morning, half a day later, and bam, back to the
same old issue:

In Picasa... import from Canon MP830 results in "Unable to locate
component" "this application failed to start because rmslantc.dll was
not found".

In MP Navigator.. hitting scan results in "Scan Failed".

The scanner does work if you use the default WIA Canon MP830 driver,
but this driver is the basic Vista driver and isnt as nice.

The instructions say to be sure to keep the unit unplugged until all
the software is installed.. I have done this route already with no
luck...

If anyone has any ideas that would be great.. based on other posts it
looks like hours get spent with Canon Support without much help
(related to XP as well, not vista).

If I happen to fix this before anyone has any ideas, I'll post my
solution here as well.

Thanks

Actually, I am using Windows XP. But I did just figure out how to work around this problem and something analogous might work in Vista as well. After countless uninstalls/reinstalls, I finally stumbled upon this solution. Not really sure how or why it works, but it does.

Find your twain_32 folder. On XP, this is C:\Windows\twain_32.

Find the subfolder for the device that isn't working. I'm using a Lide30 and for me that folder is: C:\WINDOWS\twain_32\CNQL30.

Edit your environment variable and add an entry to the System Variable named Path. Since %SystemRoot% equals "C:\Windows\twain_32", I added:
%SystemRoot%\twain_32\CNQL30

Restart any open programs, and VOILA!