I am using ACDC for PENTAX, and have changed to Windows Pro. ACDC is initially normally usable, but after 'closing' the program I am unable to re-open it - the 'hourglass' shows for a moment and then disappears. When I shut down Windows I am told ACDC is Not Responding and have to force a close. Task Manager has not shown ACDC as a running application, but it is in Processes - as 'ACDC.EXE'. Closing the process enables me to re-open the program. Any any Idea what is going on and what I can do about it???