Remove Block and Surf!

Hi everyone!
Last week I downloaded a screencamera program (do not ask me why) and after that I can't use my browser because ads are everywhere and everywhere. It is impossible to see clear when these ads just spread and I can't stand killing my PC. And my computer runs very slowly.

I checked Programs to uninstall Block&Surf, but it was not there. I use Google Chrome so I checked Extensions but there was no B&S.
I was hopeless and desperated until I found this topic: http://forums.techguy.org/virus-othe...ove-block.html

I have read it, Lindsey's problem was solved, which is the same as mine. But this topic is closed so I could not reply and I wanted to send a PM to the Hero (who helped her :D ) but I didn't manage to.

So, please HELP me! Useful things to know: Windows 8.1, Google Chrome, and probably other things are important too, so please let me know what information do you need. I am not competent in PC's things, please write down clearly every single process. And another thing: sorry for grammatical mistakes, I learn English as a foreign language.

Thank you,
Maya