Try the following - Select setup.exe and from RMB (right mouse button) use "Run as Administrator"

I think that you may find that the 9.x, and earlier versions, use a 16-bit installer for the 32-bit applications, Windows 7 won't run a 16-bit application - other users have reported getting a message that the application "is not a 32 bit application or a 64 bit compatible application" You need to get the latest software installed to work with Windows 7.

Just checked again - PSpice Student version 9.1 with web update 2 - installs and works fine - on Windows 7 (32bit) if you use "Run as Administrator" on setup.exe . It will give you a warning after install but you can select that application is installed correctly. Your problem may be specific to machine.

You can also pick the 16.3 demo from http://www.cadence.com/products/orcad/pages/downloads.aspx#pspice - there is a specific Capture/PSpice bundle.

I had the exact same problem, windows 7 64-bit as well.

Turned out all I needed to do was shut down Google Chrome, apparently. The minute I closed Chrome, the setup screen popped-up.

Don't know why, but it worked.