Try deleting and re-installing your printer instance.
In batch its hard to know when acrobat is finished.
if you are progmmer, you can wait window title to be "Adobe Acrobat" than Close Main window.
Or you can use command line pdf tool CLPrint http://commandlinepdf.com
I hope that was helpfull.
When the spooler is locked up like this, I cannot delete the printer and