Adobe Acrobat 9.4.3 and HP C410a printer scanning problems

I have an HP Photosmart Premium C410a printer.
I am running Windows 7 (64-bit).
When I try to scan a multi-page document (more than 3 pages) from Acrobat 9.4.3 to Adobe Acrobat 9.4.3, the document feeds through the ADF and seems to be scanning fine, but the document never shows up in Acrobat.  The adobe window is frozen at this point and I have to close it with the Task Manager.  When I open Acrobat again and try to scan ANY document, I get a message saying that "another program already has control of the device" (even though I have closed the HP Solutions Center by now).  At this point, I have to restart the computer.
I have spent many hours on the phone with both Adobe and HP techs, and have been working on this problem for a month already.  Adobe tells me that their software is working fine and the problem is with the HP drivers or software.  HP tells me that their drivers and software are working fine and the problem is with the Adobe Acrobat software.  At this point, I am ready to junk the HP printer and buy another Canon, since I never had any problems scanning multi-page documents (20 or more) from Adobe Acrobat with my old Canon.
Does anyone know a fix for this issue, or can tell me exactly what the problem is?  The techs are of no help.

I checked out the discussions you suggested.  I am pretty sure that my problem has something to do with the TWAIN driver.  Is it true that Adobe does not support TWAIN in 64bit.  If so, what are my options?
I can scan from Adobe Acrobat 9.4.3 using the WIA driver, but I have to scan from the glass.  Since I have a need to scan many multi-page documents (10-20 pages), this is extremely time consuming.
Thanks for your help.

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