I often get this error when attempting to overwrite a PDF that I do not have open:
"Adobe PDF" cannot access the filoe because it is in use by another application or process:
Verify that the file is not open by another application or process and try again.
I am running Windows 7 64 bit with Acrobat X Standard.
I understand that my description is vague, but my problem is kind of vague. I am willing to provide any other information that might help.