What antivirus software are you using? I do know some virus programs will 'hide' itself as an antivirus program, but is actually the virus itself. Also, I highly recommend running an anti malware/spyware program such as Malwarebytes or Superantispyware as many antivirus programs don't actually include (or is of poor quality) malware/spyware removal. Many viruses aren't actually viruses but just malware/spyware which is designed to either annoy or grab information. Lastly, it is best to run your antivirus and anti malware/spyware programs in safe mode in Windows (Google search for safe mode in your version of Windows as there are different steps to get to safe mode depending on the version) as it may keep the virus from loading into memory. If after these don't work (as well as methods you've tried from the internet), you may be best off to have a computer shop fix it as some can be quite stubborn to remove.