Operating system? Version of Adobe Reader?
Just check one thing:
1.Close all open windows so you are at your desktop.
2.Click on the start button and enter Regedit in the search field.
3.When User Account Control asks if you would like to allow this program to make changes, click on the Yes button.
4.Navigate to the following Registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
5.On the right pane, just check value of “IconsOnly” item.If its 1,right click on it and modify it to 0.If its already 0,there is some other problem L
6.Close the registry editor.Check if pdf preview has started coming in the thumbnails or not.
Thank you for the suggestion. However it was already set to 0. The problem is still there.
what OS are you using? Vista or Win 7?
Windows Vista Home Premium