To anyone that would know.

[Hickface]

Which if any PDF Driver do I install on my windows XP computer to create a PDF from an Autocad 2005 file ?

[Test Screen Name]

Not free. Adobe Acrobat includes and installs a PDF driver. A supported version of Adobe Acrobat for Windows XP is no longer sold, but you can try the 30 day trial of Acrobat XI.