How do I get rid of Searchqu.com?

I know that searchqu is a virus. It sets my homepage to this "Searchqu.com", but that was no problem changing the homepage adress. But when I open tabs now, they still go to searchqu.com... (But in internet options, I have tried to make it so when you open tabs, it goes to google, not search qu.. Obviously that didnt work) I have had this virus for almost a week now, but today, my computer slowed right down and so I used safe mode to do a system restor to how it was on the 24th... and it worked, so its fast again... but I still have this searchqu thing... and microsoft security essentials wont pick up the virus, so I dont know how im meant to remove it? Also i dont know what file i downloaded contained this virus. im not that smart when it comes to this tech ****, so does anyone know a good way of removing the virus?? thanks in advance :D