You have Ageia PhysX PPU card?
I hope this helps you to get back on business. I made originally this for myself as i did reinstall my windows couple times..

You need this:
PhysX 0.2a.7z md5sum: 75C75170AE844F92C3AB730286CF3317

Only if you running on nVidia GPUs and need to run older titles then there is PhysX Legacy driver package:
NVIDIA PhysX Legacy System Software 9.12.1031

After extracting *.7z-archive. Choose to install first ageia_physx_7.11.13_systemsoftware → after installing it install PhysX_8.09.04_SystemSoftware and... → finally install PhysX_9.10.0513_SystemSoftware as a last and newest this Ageia used to be supported to work.

Copy&paste folders Program Files (x86) and Windows at C:- drive root and accept to overwrite and be sure all goes there. Maybe need manually rename somefile as it is in use and paste then. → Run PhysX Demos.reg to add windows registery what all is needed and accept all → Double click TrayIcon 64bit - shortcut to go folder where should be by now TrayIcon.exe and run it →

Attention!%programdata%\Microsoft\Windows\Start Menu\Programs\Startup (copy&paste to windows folder address bar) where you can copy a shortcut from TrayIcon.exe to auto run and have that Tray program running at every windows boot so its makes things easier maybe for you. It's not needed. It's up to you.

... or not but click on to choose Ageia PhysX and then click OK to be finished. Go to Demo tab and have fun :) Remember first of course install carwash demo from my archive!