Can someone explain me these activities on my computer?

Hello

Can someone explain me these activities? 2 weeks ago, I set up my computer new at the apple store, because I had strange activities on my computer (disabled USB-ports, I could start my computer only in safe mode) like a zombie. Now again I have strange activities :

I found out, that this activities not appears, when I create a new guest account, and us that account for surfing the internet. Can someone explain me, what is happening on my computer?

Sincerly Stefan