Plz Help to atleast try the game ....

100% sure no software is interfering? = 99% sure

What do CPU / GPU usage levels look like?  (Afterburner or many other programs can do this, DO NOT use their overlays but if you must there are work arounds... just get it working first before adding more variables) = From Task manager i can see that CPU working is like 22 %

 Tried disabling Origin In Game?  Shift+F1, joining friends games quickly through it and coins shop won't work without OiG. = Yes

Do you have BF4 or any other games?  Assuming they work dandy? i dont have BF4 but i have so many other games and all working

Did you try either Live Chat or Callling options in the "Contact Us" link for EA? = i waited an hour on live chat and no respond 2 times = 2 hours waiting in total , and i cant call them , but i mailed them 1 week ago .

Try going to 

C:\Users\<USER>\Documents\PVZ Garden Warfare\settings\PROF_SAVE_profile

Open with Notepad.  Try changing Fullscreen settings to Borderless:

GstRender.FullscreenMode 2

GstRender.FullscreenScreen 1

--------

Try renaming the entire folder:

C:\Users\<USER>\Documents\PVZ Garden Warfare

Relaunch game.

------------

Here's a another random thing you can try messing with... I don't think a lot of those settings even work for this game.  Framelimiter and Drawfps does tho so dunno how many actually do anything.

Open Notepad.
Copy and Paste this:

RenderDevice.ForceRenderAheadLimit 1
PerfOverlay.DrawGraph 0
PerfOverlay.DrawFps 1
PostProcess.DofMethod 0
PostProcess.BlurMethod 0
PostProcess.DynamicAOEnable 0
PostProcess.DynamicAOMethod 0
Render.VSyncFlashTestEnable 0
WorldRender.TransparencyShadowmapsEnable 0
WorldRender.MotionBlurEnable 0
WorldRender.MotionForceOn 0
WorldRender.SpotLightShadowmapEnable 0
WorldRender.SpotlightShadowmapResolution 256
WorldRender.LightTileCsPathEnable 0
RenderDevice.Dx11Enable 0
RenderDevice.Dx11Dot1Enable 0
RenderDevice.Dx11Dot1RuntimeEnable 0
RenderDevice.VSyncEnable 0
RenderDevice.TripleBufferingEnable 0
GameTime.MaxVariableFps 60

Save it as "user.cfg"

You cannot have user.cfg.txt
enable "View Extentions of Known File Types" from Folder Options in Control Panel

Put it in your PvZ directory
\\Origin Games\Plants vs Zombies Garden Warfare

----------

I'm guessing you've uninstalled, reinstalled drivers.  Have you tried uninstalling, safe mode, run cleaner (extra uninstaller), restart, install again?

------

Run a benchmark like Heaven or FurMark... just to rule anything further out.

-----

I doubt it but people use this in BF4 but it's when it's already running pretty good to begin with.

http://www.coderbag.com/Programming-C/Disable-CPU-Core-Parking-Utility