Help me get back my homepage

My homepage is changed into downloadcamp.com and I have tried many ways to get my original homepage back but it seems impossible. And I am always redirected to some unknown web sites. I don't know how to fix the problem. Who is computer expert? Please help me!

According to your information, downloadcamp.com is a redirect virus which can change your system settings. It is a wise choice to get rid of it, then you can reset your homepage.
Firstly, you should remove downloadcamp.com. All of its extensions and toolbar should be removed completely.
Secondly, you should reset your original homepage.

In my mind, to remove downloadcamp.com is a necessary step to get your homepage back. To safely remove downloadcamp.com, you should ask someone who has enough computer skills for help or ask experts online to help you.