For starters we need some more information.
Make/Model of computer ( Plus any upgrades you have done since if its an off the shelf brand model, if its a custom built computer all the specs )?
Do you have a antivirus and are the definitions up to date and does it scan with no problems detected?
Have you run Malwarebytes on it to verify that the browser hasn't been hijacked?
What browser are you using?
When did this problem start ( such as any other useful information to help target the cause of your issue such as the computer was dropped or it was infected but is clean now etc )?
