I have installed a program but a lot of different program has been installed without my permission and most of these strange programs are advertisement programs. And there is a registry cleaning program which has been installed secretly. For example, some links are added by theirselves on the Internet Explorer window and sometimes there are chat Windows in which a bot woman wants to speak on love. I have uninstalled some of them via control panel but it haven't worked and I have made an antivirus scan but it also hasn't worked. How can I rescue my PC from them and how can I prevent these situations from occuring to not to have same problems in the future? Thank you. Note: My antivirus program is Vipre.