The latest update of PDCU was a major improvement and in particular is more stable for batch processing.
There might be different ways to go:
* Option 1
Download the latest software version from Pentax/ Support / Download / Software
Install it
If it runs like this, the better...
* Option 2
You might need to remove first PDCU.
(You might need to remove in addiition manually one file - see a number of threads about that one)
Re-install PDCU from the CD first (if you do not have anymore the CD, there are a few threads how to install PDCU without CD in PF)
Then install the latest update 4.33
One thing: when I use PDCU v4.33, I always do (at end): Edit / Uncheck / All images to release (or free up) all the batch queue.
Hope that the comments will help...