Immediate Results Guaranteed:
The easiest way to instantly get rid of many ads is to install a customized host file (instructions within) containing the list of all the most common advertising servers out there.
With this file installed, whenever your system tries to download a page or graphics from any of the servers on that list, it will instead point to your local machine and find nothing (unless you are running a web server on your machine - which is ok too).

If that is not enough, or if you are infected with adware, popups or other spyware, consider using a better operating system or taking some measures.