@Ketan:
The URL “http://www.pcclean.io/process-checker/” works fine for me. What you are seeing is an indication that your browser has been hijacked. If their website had ads (as far as I can tell, they don’t), you could get a message from a different website. You should run a full virus scan to check things out, and another great option is to have a HOSTS file that blocks known bad websites.