I was looking all the web for a solution for this:
When trying to install the 1.2.0 version I get an error message: "The filename, directory name. or volume label syntax is incorrect".
I've tried to install it in xp-sp3 compatible mode, and I'v tried to stop and run again the spooler (as advised in the forum: http://www.pdfforge.org/forum/help/5766-pdfcreator-windows-7-64-bit-does-not-install).
Any ideas?