I hav just installed irfanview on my computer. I can open a Tiff file in irfanview without problem, but when I try to save the file as a pdf file, I get a irfanview error message saying "PDF Save Error !". I am using this on a Windows XP Pro computer with SP3.
As a test, to see if there was anything on my computer causing the problem, I installed on another computer, also using Win XP-Pro w/ SP3. Exactly the same result!