Plot PMP File Error message

This is driving me nutz...

At work I use to have Autocad LT 2002. Now I've a full version of 2005.

But with many of my older drawing files, evertime I go to plot them I get the following Error message:

" There was an error opening the file C:\PROGRAM FILES\AUTOCAD LT

My current Printer Description file path is correct and under my User name in Documents and Settings - ...AutoCAD 2005\R16.1\enu\plotters\PMP Files

So how do I (if possible) get rid of this annoying message?

I've looked through XP Registry for the PMP file, but no joy.

Is this info buried in each DWG file?

Any thoughts appreciated.

BruceF