PLEASE HELP ME CRAZY VIRUS!!!!

Hi everyone, I guess I will get strait to the point here...I made a instalment on my laptop and strait after the installation many different programs were automatically installing (at least 10 programs) within an instance Norton was picking up on many different threats...I ran a full scan which showed over 20 different malicious files and programs, I removed them. I then ran  the Norton power eraser which showed a few more which I also removed but when the computer has restarted after the NPE scan it states Norton needs to make changes to the hard drive, every time I accept something is surpassing it Norton's request! the viruses are still on my laptop after I have repeated these steps, I have a different internet interface, weird popups and 90% CPU usage. also there are weird programs that can not be uninstalled...when I attempt to uninstall them they automatically install completely different weird programs!!! please help me people I only had my laptop for Christmas and its my first ever computer, I am very saddened by this experience.