So I just did one of the most stupid thing in my life. It's a long short, but I got a FAKE(100% sure now) Fedex e-mail today with a attached file, and I downloaded it and run it, it is a js file. Now my computer is playing random audio ads in the background of my computer, and I have no idea how to stop it..

In Windows Task Manager, it shows it is running A LOT cmd.exe, conhost.exe, iexplore.exe, svchost.exe, taskkill.exe... and a lot more.

is there anyone can help me?
p.s. I am using win7 and using Norton360. I have run Norton360 full scans multiple time and the ads are still playing. I have also tried TDSSKILLER, but it doesn't work