Presumed Infection - help needed

OS . Win. 8.1

Hi,

I have a mouse pointer, that is always busy. The Computer is slow. I had in between the Bluetooth Driver that was erased, and that i had to reinstall (it might have been due to me as well).

A scan with Norton shew no result. In safe mode, no result as well. I tried Norton power eraser, no result.

I used malwarebytes. I might have had some results but nothing I worried about.

I used adwcleaner and got the following Report

***** [ Registrierungsdatenbank ] *****

Schlüssel Gefunden : HKLM\SOFTWARE\Google\Chrome\Extensions\mkfokfffehpeedafpekjeddnmnjhmcmk
Schlüssel Gefunden : [x64] HKLM\SOFTWARE\Google\Chrome\Extensions\mkfokfffehpeedafpekjeddnmnjhmcmk

I desinstalled These extensions, that I am quiet sure, I did not install myself, as i do not use Google Chrome.

I did another scan with Norton and also macaffee security scan : no result.

The mouse pointer is still busy. The Computer is getting slower, and starts to Show Display mistakes so that yesterday I could just turn power off, to shut it down...

Thanks for the help !

Best thomas