I have Windows XP Pro as the OS on two machines and have AutoCAD 2000i
installed on both.
They work just fine.
The "secondhand" version you mentioned in your original post is probably not
a "good" or a valid version.
Perhaps, buying a "new" version would eleviate you problem with whatever OS
you are running.
I have never had a problem with AutoCAD installing on any system OS. It's
practically fool-proof as long as you have a valid version of the software.
Best regards ...
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