Need a print-to-PDF program for Win2k and WinXP

I need to add the ability to EASILY create PDF files to my company's Windows 2000 Professional AND Windows XP Professional computers.  I've seen some programs that essentially install themselves as printers, allowing the users to create PDFs by opening/creating a document in most programs (word processors, Web browsers, etc.), clicking File > Print, choosing "Print to PDF" (or something like that) as the "printer," specifying where the PDF file should be created (optional step), and clicking "OK."

I've been using pdfFactory Pro.  It's a little too complicated for the users I'm dealing with, but it's ESSENTIALLY what I need.  However, it will not work with Windows XP Professional; it forgets my configuration settings with XP, whereas it remembers them with Windows 2000 Professional.

Considerations:
The users are mostly morons when it comes to computers, so the interface has to be painfully simple (or at least configurable by me and simple to them).
A freebee program would be nice.
Disguised spyware (or other type of malware) would be AWFUL.  This MUST be avoided.

What do y'all suggest?

Thanks, folks.