🚀 go-pugleaf

Windows XP Pro SP3; CS3 InDesign 5.04; printers HP K8600DN and 970CSE:
This is a peculiar problem that developed after using CS3 InDesign trouble-free for a year or so. When in the Print Dialogue box and I set the page position to "Upper Left" (which seems to be the default position), the "P" document in the little Page Setup frame in the bottom left corner of the (Print) Setup window appears to be centered and the document prints correctly centered both vertically and horizontally on the media.
When in the Print Dialogue box and I set the page position to "Centered", the "P" document in the little Page Setup frame in the bottom left corner of the (Print) Setup window appears to be offset towards the top of the media and when the document prints, it is offset �� towards the top of the media but is centered on the vertical axis.
When I try to print InDesign documents on other printers the same problem occurs. This problem is unique to my InDesign. It does not occur with Photoshop or documents created in other page layout applications.
I have been in touch with Adobe support. They suggested uninstalling and reinstalling CS3 using their super-duper uninstall software. I also uninstalled and reinstalled printer drivers and software to cover all bases, all to no avail. The problem persists despite reinstalls.
Any ideas?