Chrome is hacked!!!!

Someone has changed my homepage to, I receive loads of annoying pop-ups and my computer runs so slow now! I have tried to use this search once, but all it does is just forces me to visit websites that look really suspicious! It seems that these redirects want me to install malware! I have been offered to install some apps already, but I did not agree! It seems like someone is controlling my computer right now! How can I fix my computer??? (sorry for my bad english)