I am here to report success!
I edited the DisplayIcon subkey in the Registry
In this Uninstall folder (in the Registry)there is a subfolder for each program that gets installed in Windows XP.
The folder for (in my case) AutoCAD Lite contained a key called DisplayIcon. The value is a pathname to a file called aclt.exe, which is the main part of AutoCAD lite.
EXE files often have icons embedded in them, often more than one, so in this Registry key, you specify the "ordinal position" of the desired Display Icon like this:
AutoCADLite/DisplayIcon: C:/Program Files/AutoCAD Lite/aclt.exe, -1
This entry is automatically created by the installer program that installs AutoCAD Lite. Apparently it does it WRONG.
OK, it installed OK under Windows 98, but apparently it's not the OK way under Windows XP???
Following the advice in the post on ElderGeek, I started experimenting with the last bit that specifies the icon.
In my case, there are only 2 icons embedded in aclt.exe
I removed the ", -1" from the end of this value and exited the Registry (it saves automatically).
Lo and behold, my Add/Remove Programs list is fixed!
Hope this helps. KUDOS to the folks at ElderGeek.