Web page blocks, and every click makes a new tab with add

[Zivac]

I have the same issue on the laptop. Should I put it in the same Threat?

 

[Zivac]

Hi,
is there any help for my problem? It is not actually my computer, but my uncle's. He is not able to fix it, and I am here only few days more, so I should fix it soon.
Today I do not see the symptoms, but I can not believe it is solved. I tried yesterday some tips from this website, but it did not help yesterday.
Tnx.