I am trying to install an old laser printer - NEC Superscript 870.  I
want to know if it is compatible with my XP Professional.  My computer
says the software has not passed Windows Logo testing and could damage
my system.  Is it and if so do I need to download something.

Hi bill789,

Take heart, you are not alone. Unless you have something else
happening there, it is more than likely a driver problem. The bad news
is NEC has abandoned the US market and hasn't issued an XP driver for
its printers. The good news is there are a couple of drivers that seem
to work ok.

Option One:
Control Panel / Printers / Delete the Nec 870 printer
Add Printer / HP / HP LaserJet IIP

Option Two:
Download Minolta PageWorks 8L (not pro) for Windows NT 4 driver
http://www.qms.com/support/current_printers/win_xp.html

Link of interest:

Forum: Computer Gripes: NEC SuperScript 870:
Scroll down to "Windows XP Driver Issues":
"...I also found that Minolta PageWorks 8L driver worked fine..."
http://www.computergripes.com/NecSuperScript870.html

I'm posting this as an answer because I'm confident that it will help.
If not, please post a clarification request and I'll be happy to have
another look.

Thank you and good luck,
hummer

Google Search Terms Used

XP "NEC SuperScript 870"