How do I remove the spyware doubleclick?

Every time I enter a search in any search engine I get the following nclk(GIF Image, 1x1 pixels) in the tab and this as the url
http://googleads.g.doubleclick.net/pagead/nclk?sa=L&ai=1&u=http%3A%2F%2Fwww.spywareremove.com%2FremoveDoubleClick.html
7 answers 7