Why am I getting a RunDLL error?

[Windows Central Question]

I started my computer this morning and now this will not stop popping up every few minutes. The error reads:
"There was a problem starting c:\progra~2\system~1\system~1.dll.
c:\progra~2\system~1\system~1.dll is not a valid Win32 application"

So now what? Not sure what this even is... Any help would be greatly appreciated, Thanks!

 

[noersetiawan]

You can start tracking what files available on that path. But my wild guess is that you've installed something that tries to run in background and probably a virus.