Multiple instances of AcroRd32.exe while using Windows Explorer Preview Pane

I'm trying to understand why our computers behave differently while browsing PDF files using Windows Explorer with the preview pane turned on.
All are Windows 7 Pro 32-bit.
The scenario:  Open Windows Explorer with the preview pane turned on, go to a folder full of PDF files, and start single-clicking on them, one by one down the list.  Keep Task Manager open, on the Processes tab, showing processes from all users, as you click on the PDF files.
On two of the computers, you can keep clicking right on the down the list, and the preview pane shows the PDF file contents immediately with each click.  The Task Manager does not show any instances of AcroRd32.exe running, and the machine does not slow down no matter how quickly you go down the list of files.  You can keep clicking all day.
On the other two computers, as you keep clicking down the list, after about six or seven clicks, the machine starts getting slower and slower in responding to display the PDF contents.  In Task Manager, you see multiple instances of AcroRd32.exe executing, and the list keeps growing with more instances - I've seen up to 8, with memory allocations to some of the instances approaching 700MB!  One of the CPU cores goes to 100%. If you stop clicking in Windows Explorer, eventually, the machine recovers, and the list of multiple instances of AcroRd32.exe shrinks, but never goes away completely until you close the Explorer window.
What could account for this difference?  One of the users is complaining - he often browses folders of scanned PDFs looking for invoices, transactions, etc., and has to go slowly to keep his machine from bogging down.  I don't know when this behavior started.
It doesn't matter if it is a shared folder on a network resource or one locally on the machine, or if it is an admin or standard Windows account - the behavior is the same.  I've tried uninstalling and reinstalling Adobe Reader, to no avail.
Thanks for any ideas.

Yes i'm having this issue to.
Becomes worse after display many documents in pane, worst even if scanned images are in.
After killing the  process, sometimes it generate even more process.
After Killing all the process, sometimes need to deactivate the pane view and activate
again to restore normal preview.
Sometimes it takes a lot of time to progress to file below, if i wait, going to files above, it pass
the file that shows delay, without any problem.
I add received from Microsoft, in answer to the same issue to uninstall adobe reader and install
latest version. It become a bit more stable, but problem still shows.
Abobe reader: 10.1.0, ATI latest drivers 11-07
Please, Help!

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