Class Installer Denies Install of HP Scanjet 2100C

Archived from groups: microsoft.public.windowsxp.help_and_support (More info?)

Getting the error "The Class Installer has denied the request to
install or upgrade this device" with an HP Scanjet 2100C.

This scanner and its scanning software "Precisionscan" worked for some time.
Then, the "Precisionscan" software stopped responding, after upgrade to
WinXP SP1. After many HP articles and support sessions, stopped using
"Precisionscan" and simply used WindowsXP WIA. Detailed HP procedures were
required to completely "uninstall" and then "reinstall" the Scanner without
its scanning software.

Now have upgraded to WinXP SP2. The Scanner will not reinstall after
upgrade. It gives the "Class Installer" error. Am again following all the
HP support articles
for full "uninstall" including removing registry keys and additional HP files
that are searched for in the Windows subdirectories, before making each
install attempt. I have the most recent (2002) WinXP driver and software
file from HP. Neither it, nor simply trying to have Windows automatically
install for WIA, works.

Windows update shows the 2100C on a list of scanners with drivers that are,
or are soon to be, included in WinXP for WIA use. Maybe this one is really
on the "soon to be" list.

Any suggestions?

Thanks, Bill