Spooler queue

I use Windows-7(64bit) aand PDF Creator 1.3.2 .
I tried to print more than 20 documents at once, and I got the problem.
First there was a problem to choose more than 15 pdf files in a directory, but I have solved this with some changes in Registry.
Then I tried to add documents via the PDF Creator options, and still it does not work.
When I choose  x<20 files, it does work.
Please help me.
We need to print in the end of the month 1000 documents automatically via PDF Creator options.

How can I maximize the spooler's queue ?

Thank you.