Every time you start Windows 10 64 bit SppExtobjHook.dll

I’m Italian, sorry for the wrong language

Whenever windows 10 starts 64 bit AVAST warns that it is infected with SppExtobjHook.dll (WIN64-gen) PUP
how can you definitively eliminate it?

SppExtobjHook.dll (WIN64-gen) [b]PUP[/b]
PUP = Possible Unwanted Program / not a infection

And where does avast say the file is located?