Re: PvZ Garden Warfare crashes while starting on windows 8.1 64 bit,

 nvwgf2umx.dll

nVidia drivers.

could you elaborate on that in more details?

Install Latest nVidia Drivers;

http://www.nvidia.com/Download/index.aspx

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If they are already up to date and re-installing them didn't work.

Go to Control Panel -> Uninstall all nVidia drivers  (3D vision, Audio, Main Display Driver, Physx)

Restart

Install latest

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Sill no?

Uninstall everything from Control Panel (again)

Go to Safe Mode

Run Display Driver Uninstaller

Restart to normal

Install latest.

http://www.guru3d.com/files-details/display-driver-uninstaller-download.html

If you get into trouble doing this, go back to Safe Mode w/ Networking.  Go to Devices and remove the Display Adapter, restart.

If you really mess things up bad for whatever reason... System Restore will put everything back.

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If you have "Optimus" which is switchable graphics.  Make sure nVidia Control Panel is forcing the 770m and not letting the Intel butt in.

http://imgur.com/a/6KJBH#87BGUaE
(Replace BF:H with PvZ; it's the same thing)

nVidia Control Panel -> 3D Settings -> Program Settings -> Add Program (PvZ) -> High Performance Processor