Cadence currently provides a free, legal, modern alternative: OrCAD Lite (version 17.4 or 22.1). This is officially supported on Windows 10/11. While it is not version 9.1, it offers unlimited simulation time but limited circuit complexity (fewer components). Download directly from cadence.com.
Assuming you have decided to proceed with finding the classic version, follow these steps carefully.
If you find that PSpice 9.1 is too difficult to run on your modern laptop, or if you need more capabilities than the 1999 version offers, there is an official modern alternative.
Cadence currently offers the OrCAD PSpice Designer (Lite) Version.
Science Publishing Group (SciencePG) is an Open Access publisher, with more than 300 online, peer-reviewed journals covering a wide range of academic disciplines. pspice 9.1 student version free download
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