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?