CIS's malfunction after installing when virus is present

So I found virus “Security Master AV” on my cousin’s laptop, so I want to install CIS to remove it. But after restart, CIS isn’t working at all, because of that I’m cut-off from Internet and I can’t uninstall it neither. Need help!

remvoal of inrections should be done from a CD, downloadl Dr. web live cd and run that.

What if I will not be able to remove CIS and restore Internet connection?

you will, first get the infection fixed and then run malwarebytes, that should fix anything that is messed up, if needed I would also run hitman pro, it can fix the stack to get the connection back.