From the large amount of PDF converters this is one that should draw your interest.
It's free. The only link added is pointing to the producer's home page. Using the classic manner of installing a virtual printer, this software can convert any printable file into PDF; very user-friendly. The conversion is being made by actually choosing the virtual printer. You can catch a window, the full screen, or a custom screen area and save it to PDF.

System Requirements:
• Windows Vista
• Windows XP
• Windows 2000
• Windows ME
• Windows NT
• Windows 98