This symptom occur because a 64-bit process that runs on a computer that is running an x64-based version of Windows cannot load the 32-bit
.dll files that are required by some program features.
You may try the following work around:
You must use the 32-bit version of Windows Explorer. The 32-bit version of Windows Explorer is located in the %windir%\Syswow64 folder on the computer that is running an x64-based version of Windows.
To use the 32-bit version of Windows Explorer, follow these steps:
Click
Start, click
Run, type the following in the
Open box, and then click
OK:
Drive_Letter:\windows\syswow64\explorer.exe /separate
Note The placeholder
Drive_Letter represents the drive where the x64-based version of Windows is installed.
For more information:
Some Windows Explorer extensions and some Control Panel items are not displayed on computers that are running an x64-based version of Windows
http://support.microsoft.com/kb/895561#appliesto
Now check if the issue is resolved.
You may want to try the following steps:
PDF thumbnail view via the Acrobat reader:
1. Run Acrobat Reader. In Reader, click File > Open and navigate to the folder(s) containing your PDF file(s). If necessary, move the slider to show all your PDF files.
2. Cancel out of Open and exit Reader.
3. Open Windows Explorer and navigate to the folders(s) containing your PDF file(s).
4. Click Views and move the slider until you see PDF thumbnails.
Thanks and Regards:
Ajay K
Microsoft Answers Support Engineer